31442985 has 48 divisors (see below), whose sum is σ = 64611456. Its totient is φ = 14370048.

The previous prime is 31442963. The next prime is 31443031. The reversal of 31442985 is 58924413.

It is not a de Polignac number, because 31442985 - 2⁶ = 31442921 is a prime.

It is a super-2 number, since 2×31442985² = 1977322611420450, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6657 + ... + 10353.

It is an arithmetic number, because the mean of its divisors is an integer number (1346072).

Almost surely, 2^31442985 is an apocalyptic number.

31442985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31442985 is an abundant number, since it is smaller than the sum of its proper divisors (33168471).

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

31442985 is an equidigital number, since it uses as much as digits as its factorization.

31442985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3724 (or 3712 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 31442985 is about 5607.4044797928. The cubic root of 31442985 is about 315.6273212913.

The spelling of 31442985 in words is "thirty-one million, four hundred forty-two thousand, nine hundred eighty-five".