31356040 has 32 divisors (see below), whose sum is σ = 71014680. Its totient is φ = 12460032.

The previous prime is 31356011. The next prime is 31356049. The reversal of 31356040 is 4065313.

It can be written as a sum of positive squares in 4 ways, for example, as 19945156 + 11410884 = 4466^2 + 3378^2 .

It is not an unprimeable number, because it can be changed into a prime (31356049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3784 + ... + 8776.

Almost surely, 2^31356040 is an apocalyptic number.

It is an amenable number.

31356040 is an abundant number, since it is smaller than the sum of its proper divisors (39658640).

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

31356040 is a wasteful number, since it uses less digits than its factorization.

31356040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5161 (or 5157 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 31356040 is about 5599.6464174089. The cubic root of 31356040 is about 315.3361323297.

It can be divided in two parts, 313560 and 40, that added together give a square (313600 = 560²).

The spelling of 31356040 in words is "thirty-one million, three hundred fifty-six thousand, forty".