309478 has 8 divisors (see below), whose sum is σ = 499968. Its totient is φ = 142824.

The previous prime is 309469. The next prime is 309479. The reversal of 309478 is 874903.

It is a happy number.

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

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

It is a congruent number.

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

309478 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5926 + ... + 5977.

It is an arithmetic number, because the mean of its divisors is an integer number (62496).

2³⁰⁹⁴⁷⁸ is an apocalyptic number.

309478 is a deficient number, since it is larger than the sum of its proper divisors (190490).

309478 is a wasteful number, since it uses less digits than its factorization.

309478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11918.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 309478 is about 556.3074689414. The cubic root of 309478 is about 67.6409856144.

It can be divided in two parts, 309 and 478, that added together give a palindrome (787).

The spelling of 309478 in words is "three hundred nine thousand, four hundred seventy-eight".