38640637 has 8 divisors (see below), whose sum is σ = 44393472. Its totient is φ = 32946000.

The previous prime is 38640631. The next prime is 38640647. The reversal of 38640637 is 73604683.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38640637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 38640596 and 38640605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38640631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13114 + ... + 15787.

It is an arithmetic number, because the mean of its divisors is an integer number (5549184).

Almost surely, 2^38640637 is an apocalyptic number.

It is an amenable number.

38640637 is a deficient number, since it is larger than the sum of its proper divisors (5752835).

38640637 is a wasteful number, since it uses less digits than its factorization.

38640637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29099.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 38640637 is about 6216.1593448045. The cubic root of 38640637 is about 338.0763252117.

The spelling of 38640637 in words is "thirty-eight million, six hundred forty thousand, six hundred thirty-seven".