308693920 has 48 divisors (see below), whose sum is σ = 747092808. Its totient is φ = 120463360.

The previous prime is 308693899. The next prime is 308693921. The reversal of 308693920 is 29396803.

It can be written as a sum of positive squares in 4 ways, for example, as 81649296 + 227044624 = 9036^2 + 15068^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (308693921) 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, 16969 + ... + 30088.

Almost surely, 2^308693920 is an apocalyptic number.

It is an amenable number.

308693920 is an abundant number, since it is smaller than the sum of its proper divisors (438398888).

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

308693920 is a wasteful number, since it uses less digits than its factorization.

308693920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47113 (or 47105 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 308693920 is about 17569.6875327935. The cubic root of 308693920 is about 675.8381321763.

The spelling of 308693920 in words is "three hundred eight million, six hundred ninety-three thousand, nine hundred twenty".