31786812 has 18 divisors (see below), whose sum is σ = 80350088. Its totient is φ = 10595592.

The previous prime is 31786801. The next prime is 31786817. The reversal of 31786812 is 21868713.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 882967 = 31786812 / (3 + 1 + 7 + 8 + 6 + 8 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31786817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 441448 + ... + 441519.

Almost surely, 2^31786812 is an apocalyptic number.

It is an amenable number.

31786812 is an abundant number, since it is smaller than the sum of its proper divisors (48563276).

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

31786812 is a wasteful number, since it uses less digits than its factorization.

31786812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882977 (or 882972 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 31786812 is about 5637.9794252906. The cubic root of 31786812 is about 316.7736079560.

The spelling of 31786812 in words is "thirty-one million, seven hundred eighty-six thousand, eight hundred twelve".