1831404 has 12 divisors (see below), whose sum is σ = 4273304. Its totient is φ = 610464.

The previous prime is 1831399. The next prime is 1831411. The reversal of 1831404 is 4041381.

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

It is a super-2 number, since 2×1831404² = 6708081222432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76297 + ... + 76320.

2^1831404 is an apocalyptic number.

It is an amenable number.

1831404 is an abundant number, since it is smaller than the sum of its proper divisors (2441900).

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

1831404 is a wasteful number, since it uses less digits than its factorization.

1831404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152624 (or 152622 counting only the distinct ones).

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

The square root of 1831404 is about 1353.2937596841. The cubic root of 1831404 is about 122.3473929168.

Adding to 1831404 its reverse (4041381), we get a palindrome (5872785).

It can be divided in two parts, 1 and 831404, that added together give a triangular number (831405 = T₁₂₈₉).

The spelling of 1831404 in words is "one million, eight hundred thirty-one thousand, four hundred four".