1405404 has 144 divisors (see below), whose sum is σ = 4919040. Its totient is φ = 336960.

The previous prime is 1405403. The next prime is 1405421. The reversal of 1405404 is 4045041.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405403) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108102 + ... + 108114.

It is an arithmetic number, because the mean of its divisors is an integer number (34160).

2^1405404 is an apocalyptic number.

1405404 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 1405404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2459520).

1405404 is an abundant number, since it is smaller than the sum of its proper divisors (3513636).

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

1405404 is a wasteful number, since it uses less digits than its factorization.

1405404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1405404 is about 1185.4973639785. The cubic root of 1405404 is about 112.0126473813.

The spelling of 1405404 in words is "one million, four hundred five thousand, four hundred four".