1256040057 has 8 divisors (see below), whose sum is σ = 1706318784. Its totient is φ = 821560688.

The previous prime is 1256040047. The next prime is 1256040061. The reversal of 1256040057 is 7500406521.

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 1256040057 - 2⁷ = 1256039929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256040017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3949653 + ... + 3949970.

It is an arithmetic number, because the mean of its divisors is an integer number (213289848).

Almost surely, 2^1256040057 is an apocalyptic number.

It is an amenable number.

1256040057 is a deficient number, since it is larger than the sum of its proper divisors (450278727).

1256040057 is an equidigital number, since it uses as much as digits as its factorization.

1256040057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7899679.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 1256040057 is about 35440.6554256549. The cubic root of 1256040057 is about 1078.9496123173.

Adding to 1256040057 its reverse (7500406521), we get a palindrome (8756446578).

The spelling of 1256040057 in words is "one billion, two hundred fifty-six million, forty thousand, fifty-seven".