309678379 has 2 divisors, whose sum is σ = 309678380. Its totient is φ = 309678378.

The previous prime is 309678361. The next prime is 309678403. The reversal of 309678379 is 973876903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 309678379 - 2¹³ = 309670187 is a prime.

It is not a weakly prime, because it can be changed into another prime (309678349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154839189 + 154839190.

It is an arithmetic number, because the mean of its divisors is an integer number (154839190).

Almost surely, 2^309678379 is an apocalyptic number.

309678379 is a deficient number, since it is larger than the sum of its proper divisors (1).

309678379 is an equidigital number, since it uses as much as digits as its factorization.

309678379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 52.

The square root of 309678379 is about 17597.6810688227. The cubic root of 309678379 is about 676.5558106097. Note that the first 3 decimals are identical.

The spelling of 309678379 in words is "three hundred nine million, six hundred seventy-eight thousand, three hundred seventy-nine".