1391404 has 36 divisors (see below), whose sum is σ = 2936640. Its totient is φ = 574560.

The previous prime is 1391393. The next prime is 1391407. The reversal of 1391404 is 4041931.

It is not an unprimeable number, because it can be changed into a prime (1391407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5962 + ... + 6190.

2^1391404 is an apocalyptic number.

1391404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1468320).

1391404 is an abundant number, since it is smaller than the sum of its proper divisors (1545236).

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

1391404 is a wasteful number, since it uses less digits than its factorization.

1391404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 269 counting only the distinct ones).

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

The square root of 1391404 is about 1179.5778906032. The cubic root of 1391404 is about 111.6394656649.

The spelling of 1391404 in words is "one million, three hundred ninety-one thousand, four hundred four".