31406985 has 24 divisors (see below), whose sum is σ = 55708224. Its totient is φ = 16359840.

The previous prime is 31406959. The next prime is 31406989. The reversal of 31406985 is 58960413.

It is not a de Polignac number, because 31406985 - 2⁵ = 31406953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31406989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6181 + ... + 10050.

It is an arithmetic number, because the mean of its divisors is an integer number (2321176).

Almost surely, 2^31406985 is an apocalyptic number.

It is an amenable number.

31406985 is a deficient number, since it is larger than the sum of its proper divisors (24301239).

31406985 is a wasteful number, since it uses less digits than its factorization.

31406985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16285 (or 16282 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 31406985 is about 5604.1935191426. The cubic root of 31406985 is about 315.5068182837.

The spelling of 31406985 in words is "thirty-one million, four hundred six thousand, nine hundred eighty-five".