1988404 has 12 divisors (see below), whose sum is σ = 3796128. Its totient is φ = 903800.

The previous prime is 1988353. The next prime is 1988411. The reversal of 1988404 is 4048891.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1988404.

It is a congruent number.

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, 22552 + ... + 22639.

It is an arithmetic number, because the mean of its divisors is an integer number (316344).

2^1988404 is an apocalyptic number.

It is an amenable number.

1988404 is a deficient number, since it is larger than the sum of its proper divisors (1807724).

1988404 is a wasteful number, since it uses less digits than its factorization.

1988404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45206 (or 45204 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1988404 is about 1410.1077972978. The cubic root of 1988404 is about 125.7481321204.

The spelling of 1988404 in words is "one million, nine hundred eighty-eight thousand, four hundred four".