31156230 has 64 divisors (see below), whose sum is σ = 86469120. Its totient is φ = 7037184.

The previous prime is 31156211. The next prime is 31156231. The reversal of 31156230 is 3265113.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 31156197 and 31156206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31156231) 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, 17857 + ... + 19523.

It is an arithmetic number, because the mean of its divisors is an integer number (1351080).

Almost surely, 2^31156230 is an apocalyptic number.

31156230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31156230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43234560).

31156230 is an abundant number, since it is smaller than the sum of its proper divisors (55312890).

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

31156230 is a wasteful number, since it uses less digits than its factorization.

31156230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 31156230 is about 5581.7765988975. The cubic root of 31156230 is about 314.6648993744.

The spelling of 31156230 in words is "thirty-one million, one hundred fifty-six thousand, two hundred thirty".