1404391 has 2 divisors, whose sum is σ = 1404392. Its totient is φ = 1404390.

The previous prime is 1404371. The next prime is 1404397. The reversal of 1404391 is 1934041.

It is a strong prime.

It is an emirp because it is prime and its reverse (1934041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1404391 - 2⁹ = 1403879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1404397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702195 + 702196.

It is an arithmetic number, because the mean of its divisors is an integer number (702196).

2^1404391 is an apocalyptic number.

1404391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1404391 is an equidigital number, since it uses as much as digits as its factorization.

1404391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1404391 is about 1185.0700401242. The cubic root of 1404391 is about 111.9857284111.

The spelling of 1404391 in words is "one million, four hundred four thousand, three hundred ninety-one".