31265040 has 160 divisors (see below), whose sum is σ = 104993280. Its totient is φ = 7667712.

The previous prime is 31265033. The next prime is 31265041. The reversal of 31265040 is 4056213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31264998 and 31265016.

It is not an unprimeable number, because it can be changed into a prime (31265041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 322272 + ... + 322368.

It is an arithmetic number, because the mean of its divisors is an integer number (656208).

Almost surely, 2^31265040 is an apocalyptic number.

31265040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31265040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52496640).

31265040 is an abundant number, since it is smaller than the sum of its proper divisors (73728240).

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

31265040 is a wasteful number, since it uses less digits than its factorization.

31265040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 31265040 is about 5591.5150004270. The cubic root of 31265040 is about 315.0307856029.

The spelling of 31265040 in words is "thirty-one million, two hundred sixty-five thousand, forty".