31138200 has 72 divisors (see below), whose sum is σ = 104578500. Its totient is φ = 8303040.

The previous prime is 31138193. The next prime is 31138213. The reversal of 31138200 is 283113.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6850 + ... + 10449.

Almost surely, 2^31138200 is an apocalyptic number.

31138200 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31138200 is an abundant number, since it is smaller than the sum of its proper divisors (73440300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31138200 is a wasteful number, since it uses less digits than its factorization.

31138200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17321 (or 17309 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 31138200 is about 5580.1612879916. The cubic root of 31138200 is about 314.6041891742.

The spelling of 31138200 in words is "thirty-one million, one hundred thirty-eight thousand, two hundred".