1057396731 has 8 divisors (see below), whose sum is σ = 1410868560. Its totient is φ = 704428032.

The previous prime is 1057396729. The next prime is 1057396777. The reversal of 1057396731 is 1376937501.

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

It is not a de Polignac number, because 1057396731 - 2¹ = 1057396729 is a prime.

It is a super-2 number, since 2×1057396731² = 2236175693458972722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1057396331) 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, 120850 + ... + 129303.

It is an arithmetic number, because the mean of its divisors is an integer number (176358570).

Almost surely, 2^1057396731 is an apocalyptic number.

1057396731 is a deficient number, since it is larger than the sum of its proper divisors (353471829).

1057396731 is a wasteful number, since it uses less digits than its factorization.

1057396731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251565.

The product of its (nonzero) digits is 119070, while the sum is 42.

The square root of 1057396731 is about 32517.6372296635. The cubic root of 1057396731 is about 1018.7774443232. Note that the first 3 decimals are identical.

The spelling of 1057396731 in words is "one billion, fifty-seven million, three hundred ninety-six thousand, seven hundred thirty-one".