38397631 has 4 divisors (see below), whose sum is σ = 38419264. Its totient is φ = 38376000.

The previous prime is 38397617. The next prime is 38397641. The reversal of 38397631 is 13679383.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 38397631 - 2¹¹ = 38395583 is a prime.

It is a super-2 number, since 2×38397631² = 2948756132824322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38397641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7890 + ... + 11791.

It is an arithmetic number, because the mean of its divisors is an integer number (9604816).

Almost surely, 2^38397631 is an apocalyptic number.

38397631 is a deficient number, since it is larger than the sum of its proper divisors (21633).

38397631 is a wasteful number, since it uses less digits than its factorization.

38397631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21632.

The product of its digits is 81648, while the sum is 40.

The square root of 38397631 is about 6196.5822031181. The cubic root of 38397631 is about 337.3661281586.

The spelling of 38397631 in words is "thirty-eight million, three hundred ninety-seven thousand, six hundred thirty-one".