1309404 has 24 divisors (see below), whose sum is σ = 3216640. Its totient is φ = 413424.

The previous prime is 1309397. The next prime is 1309411. The reversal of 1309404 is 4049031.

It is an interprime number because it is at equal distance from previous prime (1309397) and next prime (1309411).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2644 + ... + 3099.

2^1309404 is an apocalyptic number.

It is an amenable number.

1309404 is an abundant number, since it is smaller than the sum of its proper divisors (1907236).

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

1309404 is a wasteful number, since it uses less digits than its factorization.

1309404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5769 (or 5767 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1309404 is about 1144.2919207964. The cubic root of 1309404 is about 109.4018218846.

The spelling of 1309404 in words is "one million, three hundred nine thousand, four hundred four".