40221537 has 12 divisors (see below), whose sum is σ = 56601360. Its totient is φ = 25402392.

The previous prime is 40221529. The next prime is 40221557. The reversal of 40221537 is 73512204.

It is not a de Polignac number, because 40221537 - 2³ = 40221529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40221557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17487 + ... + 19652.

It is an arithmetic number, because the mean of its divisors is an integer number (4716780).

Almost surely, 2^40221537 is an apocalyptic number.

It is an amenable number.

40221537 is a deficient number, since it is larger than the sum of its proper divisors (16379823).

40221537 is a wasteful number, since it uses less digits than its factorization.

40221537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37180 (or 37161 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 40221537 is about 6342.0451748628. The cubic root of 40221537 is about 342.6253988761.

The spelling of 40221537 in words is "forty million, two hundred twenty-one thousand, five hundred thirty-seven".