31404690 has 48 divisors (see below), whose sum is σ = 82164888. Its totient is φ = 8322048.

The previous prime is 31404689. The next prime is 31404707. The reversal of 31404690 is 9640413.

It can be written as a sum of positive squares in 4 ways, for example, as 31371201 + 33489 = 5601^2 + 183^2 .

It is a super-2 number, since 2×31404690² = 1972509107992200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14562 + ... + 16578.

Almost surely, 2^31404690 is an apocalyptic number.

31404690 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 31404690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41082444).

31404690 is an abundant number, since it is smaller than the sum of its proper divisors (50760198).

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

31404690 is a wasteful number, since it uses less digits than its factorization.

31404690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203 (or 2200 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 31404690 is about 5603.9887580187. The cubic root of 31404690 is about 315.4991330954.

The spelling of 31404690 in words is "thirty-one million, four hundred four thousand, six hundred ninety".