38640537 has 32 divisors (see below), whose sum is σ = 62025600. Its totient is φ = 23633856.

The previous prime is 38640527. The next prime is 38640583. The reversal of 38640537 is 73504683.

It is a happy number.

38640537 is a `hidden beast` number, since 3 + 8 + 640 + 5 + 3 + 7 = 666.

It is not a de Polignac number, because 38640537 - 2⁴ = 38640521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38640517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99139 + ... + 99527.

It is an arithmetic number, because the mean of its divisors is an integer number (1938300).

Almost surely, 2^38640537 is an apocalyptic number.

It is an amenable number.

38640537 is a deficient number, since it is larger than the sum of its proper divisors (23385063).

38640537 is a wasteful number, since it uses less digits than its factorization.

38640537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 38640537 is about 6216.1513012474. The cubic root of 38640537 is about 338.0760335700.

The spelling of 38640537 in words is "thirty-eight million, six hundred forty thousand, five hundred thirty-seven".