31402590 has 64 divisors (see below), whose sum is σ = 79875072. Its totient is φ = 7884800.

The previous prime is 31402583. The next prime is 31402601. The reversal of 31402590 is 9520413.

It is a super-2 number, since 2×31402590² = 1972245317416200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31402590.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48670 + ... + 49310.

It is an arithmetic number, because the mean of its divisors is an integer number (1248048).

Almost surely, 2^31402590 is an apocalyptic number.

31402590 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 31402590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39937536).

31402590 is an abundant number, since it is smaller than the sum of its proper divisors (48472482).

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

31402590 is a wasteful number, since it uses less digits than its factorization.

31402590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 31402590 is about 5603.8013883435. The cubic root of 31402590 is about 315.4921005688.

The spelling of 31402590 in words is "thirty-one million, four hundred two thousand, five hundred ninety".