309431434 has 16 divisors (see below), whose sum is σ = 501258240. Its totient is φ = 142412400.

The previous prime is 309431431. The next prime is 309431449. The reversal of 309431434 is 434134903.

It is a junction number, because it is equal to n+sod(n) for n = 309431396 and 309431405.

It is not an unprimeable number, because it can be changed into a prime (309431431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7242 + ... + 25909.

It is an arithmetic number, because the mean of its divisors is an integer number (31328640).

Almost surely, 2^309431434 is an apocalyptic number.

309431434 is a deficient number, since it is larger than the sum of its proper divisors (191826806).

309431434 is a wasteful number, since it uses less digits than its factorization.

309431434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33525.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 309431434 is about 17590.6632620831. The cubic root of 309431434 is about 676.3759288197.

The spelling of 309431434 in words is "three hundred nine million, four hundred thirty-one thousand, four hundred thirty-four".