30863920 has 40 divisors (see below), whose sum is σ = 73705104. Its totient is φ = 12010752.

The previous prime is 30863909. The next prime is 30863929. The reversal of 30863920 is 2936803.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (30863929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2254 + ... + 8173.

Almost surely, 2^30863920 is an apocalyptic number.

It is an amenable number.

30863920 is an abundant number, since it is smaller than the sum of its proper divisors (42841184).

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

30863920 is a wasteful number, since it uses less digits than its factorization.

30863920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10477 (or 10471 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 30863920 is about 5555.5305777216. The cubic root of 30863920 is about 313.6777360913.

The spelling of 30863920 in words is "thirty million, eight hundred sixty-three thousand, nine hundred twenty".