31428940 has 24 divisors (see below), whose sum is σ = 66114720. Its totient is φ = 12549888.

The previous prime is 31428923. The next prime is 31428959. The reversal of 31428940 is 4982413.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15844 + ... + 17716.

It is an arithmetic number, because the mean of its divisors is an integer number (2754780).

Almost surely, 2^31428940 is an apocalyptic number.

It is an amenable number.

31428940 is an abundant number, since it is smaller than the sum of its proper divisors (34685780).

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

31428940 is a wasteful number, since it uses less digits than its factorization.

31428940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721 (or 2719 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 31428940 is about 5606.1519779614. The cubic root of 31428940 is about 315.5803193295.

The spelling of 31428940 in words is "thirty-one million, four hundred twenty-eight thousand, nine hundred forty".