31423104 has 48 divisors (see below), whose sum is σ = 90426570. Its totient is φ = 10473984.

The previous prime is 31423103. The next prime is 31423111. The reversal of 31423104 is 40132413.

It can be written as a sum of positive squares in only one way, i.e., 29680704 + 1742400 = 5448^2 + 1320^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×31423104² = 1974822929989632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31423103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12487 + ... + 14790.

Almost surely, 2^31423104 is an apocalyptic number.

It is an amenable number.

31423104 is an abundant number, since it is smaller than the sum of its proper divisors (59003466).

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

31423104 is a wasteful number, since it uses less digits than its factorization.

31423104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27297 (or 27282 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31423104 is about 5605.6314541718. The cubic root of 31423104 is about 315.5607848840.

Adding to 31423104 its reverse (40132413), we get a palindrome (71555517).

The spelling of 31423104 in words is "thirty-one million, four hundred twenty-three thousand, one hundred four".