308399969 has 2 divisors, whose sum is σ = 308399970. Its totient is φ = 308399968.

The previous prime is 308399953. The next prime is 308399981. The reversal of 308399969 is 969993803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175297600 + 133102369 = 13240^2 + 11537^2 .

It is a cyclic number.

It is not a de Polignac number, because 308399969 - 2⁴ = 308399953 is a prime.

It is a super-2 number, since 2×308399969² = 190221081758401922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (308399989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154199984 + 154199985.

It is an arithmetic number, because the mean of its divisors is an integer number (154199985).

Almost surely, 2^308399969 is an apocalyptic number.

It is an amenable number.

308399969 is a deficient number, since it is larger than the sum of its proper divisors (1).

308399969 is an equidigital number, since it uses as much as digits as its factorization.

308399969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2834352, while the sum is 56.

The square root of 308399969 is about 17561.3202521906. The cubic root of 308399969 is about 675.6235437942.

The spelling of 308399969 in words is "three hundred eight million, three hundred ninety-nine thousand, nine hundred sixty-nine".