31878946 has 24 divisors (see below), whose sum is σ = 54057744. Its totient is φ = 13982640.

The previous prime is 31878937. The next prime is 31878947. The reversal of 31878946 is 64987813.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31878896 and 31878905.

It is not an unprimeable number, because it can be changed into a prime (31878947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17641 + ... + 19363.

It is an arithmetic number, because the mean of its divisors is an integer number (2252406).

Almost surely, 2^31878946 is an apocalyptic number.

31878946 is a deficient number, since it is larger than the sum of its proper divisors (22178798).

31878946 is a wasteful number, since it uses less digits than its factorization.

31878946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 1765 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 31878946 is about 5646.1443481371. The cubic root of 31878946 is about 317.0793685836.

The spelling of 31878946 in words is "thirty-one million, eight hundred seventy-eight thousand, nine hundred forty-six".