308399980 has 24 divisors (see below), whose sum is σ = 740160288. Its totient is φ = 105737088.

The previous prime is 308399969. The next prime is 308399981. The reversal of 308399980 is 89993803.

It is a super-2 number, since 2×308399980² = 190221095328000800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (308399981) 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, 1101289 + ... + 1101568.

It is an arithmetic number, because the mean of its divisors is an integer number (30840012).

Almost surely, 2^308399980 is an apocalyptic number.

It is an amenable number.

308399980 is an abundant number, since it is smaller than the sum of its proper divisors (431760308).

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

308399980 is a wasteful number, since it uses less digits than its factorization.

308399980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202873 (or 2202871 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 308399980 is about 17561.3205653789. The cubic root of 308399980 is about 675.6235518269.

The spelling of 308399980 in words is "three hundred eight million, three hundred ninety-nine thousand, nine hundred eighty".