1240789 has 4 divisors (see below), whose sum is σ = 1353600. Its totient is φ = 1127980.

The previous prime is 1240777. The next prime is 1240793. The reversal of 1240789 is 9870421.

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 1240789 - 2¹⁵ = 1208021 is a prime.

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 Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1240789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56389 + ... + 56410.

It is an arithmetic number, because the mean of its divisors is an integer number (338400).

2^1240789 is an apocalyptic number.

It is an amenable number.

1240789 is a deficient number, since it is larger than the sum of its proper divisors (112811).

1240789 is a wasteful number, since it uses less digits than its factorization.

1240789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112810.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1240789 is about 1113.9070876873. The cubic root of 1240789 is about 107.4564886104.

The spelling of 1240789 in words is "one million, two hundred forty thousand, seven hundred eighty-nine".