31490190 has 96 divisors (see below), whose sum is σ = 85662720. Its totient is φ = 8019648.

The previous prime is 31490189. The next prime is 31490227. The reversal of 31490190 is 9109413.

It is a super-2 number, since 2×31490190² = 1983264132472200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 305679 + ... + 305781.

It is an arithmetic number, because the mean of its divisors is an integer number (892320).

Almost surely, 2^31490190 is an apocalyptic number.

31490190 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 31490190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42831360).

31490190 is an abundant number, since it is smaller than the sum of its proper divisors (54172530).

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

31490190 is a wasteful number, since it uses less digits than its factorization.

31490190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 31490190 is about 5611.6120678465. The cubic root of 31490190 is about 315.7851915647.

The spelling of 31490190 in words is "thirty-one million, four hundred ninety thousand, one hundred ninety".