1381404 has 12 divisors (see below), whose sum is σ = 3223304. Its totient is φ = 460464.

The previous prime is 1381397. The next prime is 1381409. The reversal of 1381404 is 4041831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1381404² = 3816554022432, which contains 22 as substring.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57547 + ... + 57570.

2^1381404 is an apocalyptic number.

It is an amenable number.

1381404 is an abundant number, since it is smaller than the sum of its proper divisors (1841900).

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

1381404 is a wasteful number, since it uses less digits than its factorization.

1381404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115124 (or 115122 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1381404 is about 1175.3314426152. The cubic root of 1381404 is about 111.3713719766.

The spelling of 1381404 in words is "one million, three hundred eighty-one thousand, four hundred four".