1404389 has 6 divisors (see below), whose sum is σ = 1633734. Its totient is φ = 1203720.

The previous prime is 1404371. The next prime is 1404391. The reversal of 1404389 is 9834041.

It can be written as a sum of positive squares in only one way, i.e., 1399489 + 4900 = 1183^2 + 70^2 .

It is not a de Polignac number, because 1404389 - 2⁸ = 1404133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1404289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14282 + ... + 14379.

It is an arithmetic number, because the mean of its divisors is an integer number (272289).

2^1404389 is an apocalyptic number.

It is an amenable number.

1404389 is a deficient number, since it is larger than the sum of its proper divisors (229345).

1404389 is an equidigital number, since it uses as much as digits as its factorization.

1404389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28675 (or 28668 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1404389 is about 1185.0691962919. The cubic root of 1404389 is about 111.9856752513.

The spelling of 1404389 in words is "one million, four hundred four thousand, three hundred eighty-nine".