40561257 has 24 divisors (see below), whose sum is σ = 62584480. Its totient is φ = 23284800.

The previous prime is 40561253. The next prime is 40561273. The reversal of 40561257 is 75216504.

It is not a de Polignac number, because 40561257 - 2² = 40561253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40561253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3957 + ... + 9837.

Almost surely, 2^40561257 is an apocalyptic number.

It is an amenable number.

40561257 is a deficient number, since it is larger than the sum of its proper divisors (22023223).

40561257 is a wasteful number, since it uses less digits than its factorization.

40561257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5925 (or 5914 counting only the distinct ones).

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

The square root of 40561257 is about 6368.7720166450. The cubic root of 40561257 is about 343.5873256957.

The spelling of 40561257 in words is "forty million, five hundred sixty-one thousand, two hundred fifty-seven".