1242609857 has 8 divisors (see below), whose sum is σ = 1267781760. Its totient is φ = 1217502000.

The previous prime is 1242609853. The next prime is 1242609871. The reversal of 1242609857 is 7589062421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1242609857 - 2² = 1242609853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242609853) 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 7 ways as a sum of consecutive naturals, for example, 24194 + ... + 55412.

It is an arithmetic number, because the mean of its divisors is an integer number (158472720).

Almost surely, 2^1242609857 is an apocalyptic number.

It is an amenable number.

1242609857 is a deficient number, since it is larger than the sum of its proper divisors (25171903).

1242609857 is an equidigital number, since it uses as much as digits as its factorization.

1242609857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32023.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 1242609857 is about 35250.6717240963. The cubic root of 1242609857 is about 1075.0902702635.

The spelling of 1242609857 in words is "one billion, two hundred forty-two million, six hundred nine thousand, eight hundred fifty-seven".