309745629 has 24 divisors (see below), whose sum is σ = 453056760. Its totient is φ = 203908608.

The previous prime is 309745613. The next prime is 309745691. The reversal of 309745629 is 926547903.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 94536729 + 215208900 = 9723^2 + 14670^2 .

It is not a de Polignac number, because 309745629 - 2⁴ = 309745613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309745609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281809 + ... + 282905.

It is an arithmetic number, because the mean of its divisors is an integer number (18877365).

Almost surely, 2^309745629 is an apocalyptic number.

It is an amenable number.

309745629 is a deficient number, since it is larger than the sum of its proper divisors (143311131).

309745629 is a wasteful number, since it uses less digits than its factorization.

309745629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469 (or 1466 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 309745629 is about 17599.5917282192. The cubic root of 309745629 is about 676.6047808621.

The spelling of 309745629 in words is "three hundred nine million, seven hundred forty-five thousand, six hundred twenty-nine".