30929985 has 32 divisors (see below), whose sum is σ = 55313280. Its totient is φ = 16398144.

The previous prime is 30929981. The next prime is 30930019. The reversal of 30929985 is 58992903.

It is not a de Polignac number, because 30929985 - 2² = 30929981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30929985.

It is not an unprimeable number, because it can be changed into a prime (30929981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26014 + ... + 27176.

It is an arithmetic number, because the mean of its divisors is an integer number (1728540).

Almost surely, 2^30929985 is an apocalyptic number.

It is an amenable number.

30929985 is a deficient number, since it is larger than the sum of its proper divisors (24383295).

30929985 is a wasteful number, since it uses less digits than its factorization.

30929985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 30929985 is about 5561.4732760304. The cubic root of 30929985 is about 313.9013882940.

The spelling of 30929985 in words is "thirty million, nine hundred twenty-nine thousand, nine hundred eighty-five".