308904949 has 2 divisors, whose sum is σ = 308904950. Its totient is φ = 308904948.

The previous prime is 308904923. The next prime is 308904989. The reversal of 308904949 is 949409803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302238225 + 6666724 = 17385^2 + 2582^2 .

It is a cyclic number.

It is not a de Polignac number, because 308904949 - 2²⁷ = 174687221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 308904899 and 308904908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (308904989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154452474 + 154452475.

It is an arithmetic number, because the mean of its divisors is an integer number (154452475).

Almost surely, 2^308904949 is an apocalyptic number.

It is an amenable number.

308904949 is a deficient number, since it is larger than the sum of its proper divisors (1).

308904949 is an equidigital number, since it uses as much as digits as its factorization.

308904949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 308904949 is about 17575.6919920668. The cubic root of 308904949 is about 675.9921023376.

The spelling of 308904949 in words is "three hundred eight million, nine hundred four thousand, nine hundred forty-nine".