309420379 has 2 divisors, whose sum is σ = 309420380. Its totient is φ = 309420378.

The previous prime is 309420373. The next prime is 309420407. The reversal of 309420379 is 973024903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 309420379 - 2⁹ = 309419867 is a prime.

It is equal to p_16734862 and since 309420379 and 16734862 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (309420373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154710189 + 154710190.

It is an arithmetic number, because the mean of its divisors is an integer number (154710190).

Almost surely, 2^309420379 is an apocalyptic number.

309420379 is a deficient number, since it is larger than the sum of its proper divisors (1).

309420379 is an equidigital number, since it uses as much as digits as its factorization.

309420379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 309420379 is about 17590.3490300790. The cubic root of 309420379 is about 676.3678738042.

The spelling of 309420379 in words is "three hundred nine million, four hundred twenty thousand, three hundred seventy-nine".