31471040 has 28 divisors (see below), whose sum is σ = 74941176. Its totient is φ = 12588288.

The previous prime is 31471031. The next prime is 31471043. The reversal of 31471040 is 4017413.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31471043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48854 + ... + 49493.

Almost surely, 2^31471040 is an apocalyptic number.

It is an amenable number.

31471040 is an abundant number, since it is smaller than the sum of its proper divisors (43470136).

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

31471040 is an equidigital number, since it uses as much as digits as its factorization.

31471040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98364 (or 98354 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 31471040 is about 5609.9055250512. The cubic root of 31471040 is about 315.7211662003.

Adding to 31471040 its reverse (4017413), we get a palindrome (35488453).

The spelling of 31471040 in words is "thirty-one million, four hundred seventy-one thousand, forty".