31477812 has 24 divisors (see below), whose sum is σ = 77769216. Its totient is φ = 9875328.

The previous prime is 31477811. The next prime is 31477841. The reversal of 31477812 is 21877413.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31477811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76948 + ... + 77355.

It is an arithmetic number, because the mean of its divisors is an integer number (3240384).

Almost surely, 2^31477812 is an apocalyptic number.

It is an amenable number.

31477812 is an abundant number, since it is smaller than the sum of its proper divisors (46291404).

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

31477812 is a wasteful number, since it uses less digits than its factorization.

31477812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154327 (or 154325 counting only the distinct ones).

The product of its digits is 9408, while the sum is 33.

The square root of 31477812 is about 5610.5090678119. The cubic root of 31477812 is about 315.7438104091.

The spelling of 31477812 in words is "thirty-one million, four hundred seventy-seven thousand, eight hundred twelve".