309947 has 8 divisors (see below), whose sum is σ = 356160. Its totient is φ = 266760.

The previous prime is 309937. The next prime is 309977. The reversal of 309947 is 749903.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 309947 - 2⁴ = 309931 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309947.

It is not an unprimeable number, because it can be changed into a prime (309937) 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, 533 + ... + 950.

It is an arithmetic number, because the mean of its divisors is an integer number (44520).

2³⁰⁹⁹⁴⁷ is an apocalyptic number.

309947 is a deficient number, since it is larger than the sum of its proper divisors (46213).

309947 is a wasteful number, since it uses less digits than its factorization.

309947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 309947 is about 556.7288388435. The cubic root of 309947 is about 67.6751373263.

The spelling of 309947 in words is "three hundred nine thousand, nine hundred forty-seven".