309473997 has 16 divisors (see below), whose sum is σ = 472855680. Its totient is φ = 176363712.

The previous prime is 309473987. The next prime is 309474013. The reversal of 309473997 is 799374903.

It is not a de Polignac number, because 309473997 - 2⁷ = 309473869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309473977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11922 + ... + 27587.

It is an arithmetic number, because the mean of its divisors is an integer number (29553480).

Almost surely, 2^309473997 is an apocalyptic number.

It is an amenable number.

309473997 is a deficient number, since it is larger than the sum of its proper divisors (163381683).

309473997 is a wasteful number, since it uses less digits than its factorization.

309473997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39892.

The product of its (nonzero) digits is 1285956, while the sum is 51.

The square root of 309473997 is about 17591.8730384232. The cubic root of 309473997 is about 676.4069397488.

The spelling of 309473997 in words is "three hundred nine million, four hundred seventy-three thousand, nine hundred ninety-seven".