30985944 has 32 divisors (see below), whose sum is σ = 84507840. Its totient is φ = 9389600.

The previous prime is 30985943. The next prime is 30985961. The reversal of 30985944 is 44958903.

It is a super-2 number, since 2×30985944² = 1920257451142272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30985896 and 30985905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30985943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58422 + ... + 58949.

It is an arithmetic number, because the mean of its divisors is an integer number (2640870).

Almost surely, 2^30985944 is an apocalyptic number.

It is an amenable number.

30985944 is an abundant number, since it is smaller than the sum of its proper divisors (53521896).

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

30985944 is a wasteful number, since it uses less digits than its factorization.

30985944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117391 (or 117387 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 30985944 is about 5566.5019536510. The cubic root of 30985944 is about 314.0905793018.

It can be divided in two parts, 309859 and 44, that added together give a palindrome (309903).

The spelling of 30985944 in words is "thirty million, nine hundred eighty-five thousand, nine hundred forty-four".