1081404 has 96 divisors (see below), whose sum is σ = 3225600. Its totient is φ = 311040.

The previous prime is 1081403. The next prime is 1081417. The reversal of 1081404 is 4041801.

It is a super-2 number, since 2×1081404² = 2338869222432, which contains 22 as substring.

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 (1081403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34869 + ... + 34899.

It is an arithmetic number, because the mean of its divisors is an integer number (33600).

2^1081404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1081404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1612800).

1081404 is an abundant number, since it is smaller than the sum of its proper divisors (2144196).

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

1081404 is a wasteful number, since it uses less digits than its factorization.

1081404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1081404 is about 1039.9057649614. The cubic root of 1081404 is about 102.6429969234.

It can be divided in two parts, 1081 and 404, that added together give a triangular number (1485 = T₅₄).

The spelling of 1081404 in words is "one million, eighty-one thousand, four hundred four".