309429945 has 24 divisors (see below), whose sum is σ = 585104832. Its totient is φ = 150026400.

The previous prime is 309429943. The next prime is 309429947. The reversal of 309429945 is 549924903.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (309429943) and next prime (309429947).

It is not a de Polignac number, because 309429945 - 2¹ = 309429943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 309429945.

It is not an unprimeable number, because it can be changed into a prime (309429943) 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, 312061 + ... + 313050.

It is an arithmetic number, because the mean of its divisors is an integer number (24379368).

Almost surely, 2^309429945 is an apocalyptic number.

It is an amenable number.

309429945 is a deficient number, since it is larger than the sum of its proper divisors (275674887).

309429945 is a wasteful number, since it uses less digits than its factorization.

309429945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625133 (or 625130 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 309429945 is about 17590.6209384433. The cubic root of 309429945 is about 676.3748438993.

The spelling of 309429945 in words is "three hundred nine million, four hundred twenty-nine thousand, nine hundred forty-five".