31485930 has 48 divisors (see below), whose sum is σ = 87907680. Its totient is φ = 7196448.

The previous prime is 31485917. The next prime is 31485931. The reversal of 31485930 is 3958413.

It is a junction number, because it is equal to n+sod(n) for n = 31485891 and 31485900.

It is not an unprimeable number, because it can be changed into a prime (31485931) 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, 9240 + ... + 12179.

It is an arithmetic number, because the mean of its divisors is an integer number (1831410).

Almost surely, 2^31485930 is an apocalyptic number.

31485930 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31485930 is an abundant number, since it is smaller than the sum of its proper divisors (56421750).

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

31485930 is a wasteful number, since it uses less digits than its factorization.

31485930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21443 (or 21436 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 31485930 is about 5611.2324849359. The cubic root of 31485930 is about 315.7709510919.

The spelling of 31485930 in words is "thirty-one million, four hundred eighty-five thousand, nine hundred thirty".