1681404 has 24 divisors (see below), whose sum is σ = 3989328. Its totient is φ = 551040.

The previous prime is 1681403. The next prime is 1681411. The reversal of 1681404 is 4041861.

It is a super-2 number, since 2×1681404² = 5654238822432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417 + ... + 1880.

It is an arithmetic number, because the mean of its divisors is an integer number (166222).

2^1681404 is an apocalyptic number.

It is an amenable number.

1681404 is an abundant number, since it is smaller than the sum of its proper divisors (2307924).

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

1681404 is a wasteful number, since it uses less digits than its factorization.

1681404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365 (or 2363 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 1681404 is about 1296.6896313305. The cubic root of 1681404 is about 118.9115459709.

The spelling of 1681404 in words is "one million, six hundred eighty-one thousand, four hundred four".