307920385 has 4 divisors (see below), whose sum is σ = 369504468. Its totient is φ = 246336304.

The previous prime is 307920383. The next prime is 307920391. The reversal of 307920385 is 583029703.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583029703 = 16447 ⋅35449.

It can be written as a sum of positive squares in 2 ways, for example, as 231252849 + 76667536 = 15207^2 + 8756^2 .

It is a cyclic number.

It is not a de Polignac number, because 307920385 - 2¹ = 307920383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (307920383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30792034 + ... + 30792043.

It is an arithmetic number, because the mean of its divisors is an integer number (92376117).

Almost surely, 2^307920385 is an apocalyptic number.

It is an amenable number.

307920385 is a deficient number, since it is larger than the sum of its proper divisors (61584083).

307920385 is an equidigital number, since it uses as much as digits as its factorization.

307920385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61584082.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 307920385 is about 17547.6603853619. The cubic root of 307920385 is about 675.2731477969.

The spelling of 307920385 in words is "three hundred seven million, nine hundred twenty thousand, three hundred eighty-five".