31540036 has 12 divisors (see below), whose sum is σ = 60212880. Its totient is φ = 14336360.

The previous prime is 31540031. The next prime is 31540063. The reversal of 31540036 is 63004513.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31539989 and 31540016.

It is not an unprimeable number, because it can be changed into a prime (31540031) 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, 358366 + ... + 358453.

It is an arithmetic number, because the mean of its divisors is an integer number (5017740).

Almost surely, 2^31540036 is an apocalyptic number.

It is an amenable number.

31540036 is a deficient number, since it is larger than the sum of its proper divisors (28672844).

31540036 is a wasteful number, since it uses less digits than its factorization.

31540036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716834 (or 716832 counting only the distinct ones).

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

The square root of 31540036 is about 5616.0516379392. The cubic root of 31540036 is about 315.9517231168.

Adding to 31540036 its reverse (63004513), we get a palindrome (94544549).

The spelling of 31540036 in words is "thirty-one million, five hundred forty thousand, thirty-six".