31485894 has 48 divisors (see below), whose sum is σ = 71500800. Its totient is φ = 9226800.

The previous prime is 31485893. The next prime is 31485917. The reversal of 31485894 is 49858413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31485893) 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, 21807 + ... + 23205.

It is an arithmetic number, because the mean of its divisors is an integer number (1489600).

Almost surely, 2^31485894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31485894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35750400).

31485894 is an abundant number, since it is smaller than the sum of its proper divisors (40014906).

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

31485894 is a wasteful number, since it uses less digits than its factorization.

31485894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457 (or 1446 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 31485894 is about 5611.2292770836. The cubic root of 31485894 is about 315.7708307444.

The spelling of 31485894 in words is "thirty-one million, four hundred eighty-five thousand, eight hundred ninety-four".