309430 has 32 divisors (see below), whose sum is σ = 635040. Its totient is φ = 107520.

The previous prime is 309403. The next prime is 309433. The reversal of 309430 is 34903.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 309398 and 309407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309433) 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, 3142 + ... + 3238.

It is an arithmetic number, because the mean of its divisors is an integer number (19845).

2³⁰⁹⁴³⁰ is an apocalyptic number.

309430 is an abundant number, since it is smaller than the sum of its proper divisors (325610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309430 is a wasteful number, since it uses less digits than its factorization.

309430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 309430 is about 556.2643256582. The cubic root of 309430 is about 67.6374883974.

It can be divided in two parts, 309 and 430, that multiplied together give a triangular number (132870 = T₅₁₅).

The spelling of 309430 in words is "three hundred nine thousand, four hundred thirty".