31389472 has 12 divisors (see below), whose sum is σ = 61798086. Its totient is φ = 15694720.

The previous prime is 31389461. The next prime is 31389473. The reversal of 31389472 is 27498313.

It can be written as a sum of positive squares in only one way, i.e., 28686736 + 2702736 = 5356^2 + 1644^2 .

It is not an unprimeable number, because it can be changed into a prime (31389473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490429 + ... + 490492.

Almost surely, 2^31389472 is an apocalyptic number.

31389472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31389472 is a deficient number, since it is larger than the sum of its proper divisors (30408614).

31389472 is an equidigital number, since it uses as much as digits as its factorization.

31389472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980931 (or 980923 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 31389472 is about 5602.6308106103. The cubic root of 31389472 is about 315.4481636219.

The spelling of 31389472 in words is "thirty-one million, three hundred eighty-nine thousand, four hundred seventy-two".