309440434 has 16 divisors (see below), whose sum is σ = 477469440. Its totient is φ = 150345360.

The previous prime is 309440431. The next prime is 309440449. The reversal of 309440434 is 434044903.

It is a junction number, because it is equal to n+sod(n) for n = 309440396 and 309440405.

It is not an unprimeable number, because it can be changed into a prime (309440431) 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, 5154 + ... + 25405.

It is an arithmetic number, because the mean of its divisors is an integer number (29841840).

Almost surely, 2^309440434 is an apocalyptic number.

309440434 is a deficient number, since it is larger than the sum of its proper divisors (168029006).

309440434 is a wasteful number, since it uses less digits than its factorization.

309440434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30705.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 309440434 is about 17590.9190777515. The cubic root of 309440434 is about 676.3824863568.

The spelling of 309440434 in words is "three hundred nine million, four hundred forty thousand, four hundred thirty-four".