31474729 has 12 divisors (see below), whose sum is σ = 37182672. Its totient is φ = 26410800.

The previous prime is 31474721. The next prime is 31474733. The reversal of 31474729 is 92747413.

It is not a de Polignac number, because 31474729 - 2³ = 31474721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31474721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6607 + ... + 10324.

It is an arithmetic number, because the mean of its divisors is an integer number (3098556).

Almost surely, 2^31474729 is an apocalyptic number.

It is an amenable number.

31474729 is a deficient number, since it is larger than the sum of its proper divisors (5707943).

31474729 is a wasteful number, since it uses less digits than its factorization.

31474729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16968 (or 16955 counting only the distinct ones).

The product of its digits is 42336, while the sum is 37.

The square root of 31474729 is about 5610.2343088324. The cubic root of 31474729 is about 315.7335018786.

The spelling of 31474729 in words is "thirty-one million, four hundred seventy-four thousand, seven hundred twenty-nine".