31138230 has 16 divisors (see below), whose sum is σ = 74731824. Its totient is φ = 8303520.

The previous prime is 31138213. The next prime is 31138249. The reversal of 31138230 is 3283113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31138197 and 31138206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518941 + ... + 519000.

It is an arithmetic number, because the mean of its divisors is an integer number (4670739).

Almost surely, 2^31138230 is an apocalyptic number.

31138230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31138230 is an abundant number, since it is smaller than the sum of its proper divisors (43593594).

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

31138230 is a wasteful number, since it uses less digits than its factorization.

31138230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037951.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 31138230 is about 5580.1639760853. The cubic root of 31138230 is about 314.6042902090.

The spelling of 31138230 in words is "thirty-one million, one hundred thirty-eight thousand, two hundred thirty".