309494399 has 2 divisors, whose sum is σ = 309494400. Its totient is φ = 309494398.

The previous prime is 309494357. The next prime is 309494407. The reversal of 309494399 is 993494903.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 309494399 - 2¹² = 309490303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309494309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154747199 + 154747200.

It is an arithmetic number, because the mean of its divisors is an integer number (154747200).

Almost surely, 2^309494399 is an apocalyptic number.

309494399 is a deficient number, since it is larger than the sum of its proper divisors (1).

309494399 is an equidigital number, since it uses as much as digits as its factorization.

309494399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 944784, while the sum is 50.

The square root of 309494399 is about 17592.4528988996. The cubic root of 309494399 is about 676.4218034113.

The spelling of 309494399 in words is "three hundred nine million, four hundred ninety-four thousand, three hundred ninety-nine".