308238640 has 40 divisors (see below), whose sum is σ = 747818208. Its totient is φ = 117934080.

The previous prime is 308238599. The next prime is 308238641. The reversal of 308238640 is 46832803.

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

It is a super-2 number, since 2×308238640² = 190022118378099200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 308238596 and 308238605.

It is not an unprimeable number, because it can be changed into a prime (308238641) 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, 81921 + ... + 85600.

Almost surely, 2^308238640 is an apocalyptic number.

It is an amenable number.

308238640 is an abundant number, since it is smaller than the sum of its proper divisors (439579568).

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

308238640 is a wasteful number, since it uses less digits than its factorization.

308238640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167557 (or 167551 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 308238640 is about 17556.7263463323. The cubic root of 308238640 is about 675.5057133863.

The spelling of 308238640 in words is "three hundred eight million, two hundred thirty-eight thousand, six hundred forty".