309394 has 12 divisors (see below), whose sum is σ = 481194. Its totient is φ = 149184.

The previous prime is 309391. The next prime is 309403. The reversal of 309394 is 493903.

It can be written as a sum of positive squares in 3 ways, for example, as 288369 + 21025 = 537^2 + 145^2 .

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309391) 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, 2682 + ... + 2794.

2³⁰⁹³⁹⁴ is an apocalyptic number.

309394 is a deficient number, since it is larger than the sum of its proper divisors (171800).

309394 is a wasteful number, since it uses less digits than its factorization.

309394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 309394 is about 556.2319659998. The cubic root of 309394 is about 67.6348652473.

It can be divided in two parts, 309 and 394, that added together give a triangular number (703 = T₃₇).

The spelling of 309394 in words is "three hundred nine thousand, three hundred ninety-four".