31402472 has 8 divisors (see below), whose sum is σ = 58879650. Its totient is φ = 15701232.

The previous prime is 31402471. The next prime is 31402477. The reversal of 31402472 is 27420413.

It can be written as a sum of positive squares in only one way, i.e., 26357956 + 5044516 = 5134^2 + 2246^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×31402472² = 1972230495421568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31402471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1962647 + ... + 1962662.

Almost surely, 2^31402472 is an apocalyptic number.

It is an amenable number.

31402472 is a deficient number, since it is larger than the sum of its proper divisors (27477178).

31402472 is a wasteful number, since it uses less digits than its factorization.

31402472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3925315 (or 3925311 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 31402472 is about 5603.7908597663. The cubic root of 31402472 is about 315.4917053985.

Adding to 31402472 its reverse (27420413), we get a palindrome (58822885).

The spelling of 31402472 in words is "thirty-one million, four hundred two thousand, four hundred seventy-two".