1242919 has 4 divisors (see below), whose sum is σ = 1245496. Its totient is φ = 1240344.

The previous prime is 1242893. The next prime is 1242929. The reversal of 1242919 is 9192421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1242919 - 2⁹ = 1242407 is a prime.

It is a super-2 number, since 2×1242919² = 3089695281122, which contains 22 as substring.

It is a Duffinian number.

1242919 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242929) 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, 324 + ... + 1609.

It is an arithmetic number, because the mean of its divisors is an integer number (311374).

2^1242919 is an apocalyptic number.

1242919 is a deficient number, since it is larger than the sum of its proper divisors (2577).

1242919 is an equidigital number, since it uses as much as digits as its factorization.

1242919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576.

The product of its digits is 1296, while the sum is 28.

The square root of 1242919 is about 1114.8627718244. The cubic root of 1242919 is about 107.5179418404.

The spelling of 1242919 in words is "one million, two hundred forty-two thousand, nine hundred nineteen".