30923840 has 56 divisors (see below), whose sum is σ = 75465432. Its totient is φ = 12062720.

The previous prime is 30923813. The next prime is 30923863. The reversal of 30923840 is 4832903.

It can be written as a sum of positive squares in 4 ways, for example, as 541696 + 30382144 = 736^2 + 5512^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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, 11942 + ... + 14298.

It is an arithmetic number, because the mean of its divisors is an integer number (1347597).

Almost surely, 2^30923840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30923840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37732716).

30923840 is an abundant number, since it is smaller than the sum of its proper divisors (44541592).

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

30923840 is a wasteful number, since it uses less digits than its factorization.

30923840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415 (or 2405 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 30923840 is about 5560.9207870640. The cubic root of 30923840 is about 313.8805988477.

The spelling of 30923840 in words is "thirty million, nine hundred twenty-three thousand, eight hundred forty".