31385190 has 32 divisors (see below), whose sum is σ = 76930560. Its totient is φ = 8190944.

The previous prime is 31385183. The next prime is 31385203. The reversal of 31385190 is 9158313.

It is a happy number.

It is a super-2 number, since 2×31385190² = 1970060302672200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9720 + ... + 12539.

It is an arithmetic number, because the mean of its divisors is an integer number (2404080).

Almost surely, 2^31385190 is an apocalyptic number.

31385190 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31385190 is an abundant number, since it is smaller than the sum of its proper divisors (45545370).

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

31385190 is a wasteful number, since it uses less digits than its factorization.

31385190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22316.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 31385190 is about 5602.2486556739. The cubic root of 31385190 is about 315.4338189985.

The spelling of 31385190 in words is "thirty-one million, three hundred eighty-five thousand, one hundred ninety".