40357521 has 20 divisors (see below), whose sum is σ = 61694512. Its totient is φ = 26277048.

The previous prime is 40357483. The next prime is 40357523. The reversal of 40357521 is 12575304.

It is a happy number.

It is not a de Polignac number, because 40357521 - 2¹¹ = 40355473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40357523) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2311 + ... + 9276.

Almost surely, 2^40357521 is an apocalyptic number.

It is an amenable number.

40357521 is a deficient number, since it is larger than the sum of its proper divisors (21336991).

40357521 is a wasteful number, since it uses less digits than its factorization.

40357521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11642 (or 11633 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 40357521 is about 6352.7569605644. The cubic root of 40357521 is about 343.0110891252.

The spelling of 40357521 in words is "forty million, three hundred fifty-seven thousand, five hundred twenty-one".