31212084 has 24 divisors (see below), whose sum is σ = 73917088. Its totient is φ = 10248480.

The previous prime is 31212061. The next prime is 31212113. The reversal of 31212084 is 48021213.

It is a self number, because there is not a number n which added to its sum of digits gives 31212084.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18607 + ... + 20214.

Almost surely, 2^31212084 is an apocalyptic number.

It is an amenable number.

31212084 is an abundant number, since it is smaller than the sum of its proper divisors (42705004).

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

31212084 is a wasteful number, since it uses less digits than its factorization.

31212084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38895 (or 38893 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 31212084 is about 5586.7776043082. Note that the first 3 decimals coincide. The cubic root of 31212084 is about 314.8528211404.

Adding to 31212084 its reverse (48021213), we get a palindrome (79233297).

The spelling of 31212084 in words is "thirty-one million, two hundred twelve thousand, eighty-four".