31421900 has 18 divisors (see below), whose sum is σ = 68185740. Its totient is φ = 12568720.

The previous prime is 31421881. The next prime is 31421939. The reversal of 31421900 is 912413.

It is a super-2 number, since 2×31421900² = 1974671599220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 157010 + ... + 157209.

Almost surely, 2^31421900 is an apocalyptic number.

It is an amenable number.

31421900 is an abundant number, since it is smaller than the sum of its proper divisors (36763840).

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

31421900 is a wasteful number, since it uses less digits than its factorization.

31421900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314233 (or 314226 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 31421900 is about 5605.5240611383. The cubic root of 31421900 is about 315.5567545158.

The spelling of 31421900 in words is "thirty-one million, four hundred twenty-one thousand, nine hundred".