309475 has 6 divisors (see below), whose sum is σ = 383780. Its totient is φ = 247560.

The previous prime is 309469. The next prime is 309479. The reversal of 309475 is 574903.

It is not a de Polignac number, because 309475 - 2¹⁵ = 276707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (309479) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6165 + ... + 6214.

2³⁰⁹⁴⁷⁵ is an apocalyptic number.

309475 is a deficient number, since it is larger than the sum of its proper divisors (74305).

309475 is a wasteful number, since it uses less digits than its factorization.

309475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12389 (or 12384 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 309475 is about 556.3047725842. The cubic root of 309475 is about 67.6407670489.

It can be divided in two parts, 309 and 475, that added together give a square (784 = 28²).

The spelling of 309475 in words is "three hundred nine thousand, four hundred seventy-five".