308399973 has 12 divisors (see below), whose sum is σ = 478334880. Its totient is φ = 176228472.

The previous prime is 308399969. The next prime is 308399981. The reversal of 308399973 is 379993803.

It is a happy number.

It is not a de Polignac number, because 308399973 - 2² = 308399969 is a prime.

It is a super-2 number, since 2×308399973² = 190221086692801458, which contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308399953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1048833 + ... + 1049126.

It is an arithmetic number, because the mean of its divisors is an integer number (39861240).

Almost surely, 2^308399973 is an apocalyptic number.

It is an amenable number.

308399973 is a deficient number, since it is larger than the sum of its proper divisors (169934907).

308399973 is a wasteful number, since it uses less digits than its factorization.

308399973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097976 (or 2097969 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 51.

The square root of 308399973 is about 17561.3203660773. The cubic root of 308399973 is about 675.6235467152.

The spelling of 308399973 in words is "three hundred eight million, three hundred ninety-nine thousand, nine hundred seventy-three".