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1242769 = 11112979

1242769 has 4 divisors (see below), whose sum is σ = 1355760. Its totient is φ = 1129780.

The previous prime is 1242767. The next prime is 1242781. The reversal of 1242769 is 9672421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1242769 - 21 = 1242767 is a prime.

It is a super-2 number, since 2×12427692 = 3088949574722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 1 + 213 + 42 + 217 + 77 + 67 + 9 .

It is a Duffinian number.

1242769 is a lucky number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1242769.

It is not an unprimeable number, because it can be changed into a prime (1242763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56479 + ... + 56500.

It is an arithmetic number, because the mean of its divisors is an integer number (338940).

21242769 is an apocalyptic number.

It is an amenable number.

1242769 is a deficient number, since it is larger than the sum of its proper divisors (112991).

1242769 is a wasteful number, since it uses less digits than its factorization.

1242769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112990.

The product of its digits is 6048, while the sum is 31.

The square root of 1242769 is about 1114.7954969410. The cubic root of 1242769 is about 107.5136164472.

The spelling of 1242769 in words is "one million, two hundred forty-two thousand, seven hundred sixty-nine".

Divisors: 1 11 112979 1242769