31065940 has 24 divisors (see below), whose sum is σ = 67003272. Its totient is φ = 12090240.

The previous prime is 31065901. The next prime is 31065941. The reversal of 31065940 is 4956013.

It can be written as a sum of positive squares in 4 ways, for example, as 1602756 + 29463184 = 1266^2 + 5428^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31065899 and 31065908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31065941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20251 + ... + 21730.

It is an arithmetic number, because the mean of its divisors is an integer number (2791803).

Almost surely, 2^31065940 is an apocalyptic number.

It is an amenable number.

31065940 is an abundant number, since it is smaller than the sum of its proper divisors (35937332).

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

31065940 is a wasteful number, since it uses less digits than its factorization.

31065940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42027 (or 42025 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 31065940 is about 5573.6828040354. The cubic root of 31065940 is about 314.3606415216.

The spelling of 31065940 in words is "thirty-one million, sixty-five thousand, nine hundred forty".