1057640253 has 8 divisors (see below), whose sum is σ = 1410357408. Its totient is φ = 705008304.

The previous prime is 1057640249. The next prime is 1057640291. The reversal of 1057640253 is 3520467501.

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

It is not a de Polignac number, because 1057640253 - 2² = 1057640249 is a prime.

It is a super-2 number, since 2×1057640253² = 2237205809531808018, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057640203) 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, 18051 + ... + 49407.

It is an arithmetic number, because the mean of its divisors is an integer number (176294676).

Almost surely, 2^1057640253 is an apocalyptic number.

It is an amenable number.

1057640253 is a deficient number, since it is larger than the sum of its proper divisors (352717155).

1057640253 is a wasteful number, since it uses less digits than its factorization.

1057640253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42603.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 1057640253 is about 32521.3814743470. The cubic root of 1057640253 is about 1018.8556476031.

The spelling of 1057640253 in words is "one billion, fifty-seven million, six hundred forty thousand, two hundred fifty-three".