1986404 has 24 divisors (see below), whose sum is σ = 4041408. Its totient is φ = 836640.

The previous prime is 1986401. The next prime is 1986421. The reversal of 1986404 is 4046891.

It is not an unprimeable number, because it can be changed into a prime (1986401) 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, 1127 + ... + 2289.

It is an arithmetic number, because the mean of its divisors is an integer number (168392).

2^1986404 is an apocalyptic number.

1986404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1986404 is an abundant number, since it is smaller than the sum of its proper divisors (2055004).

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

1986404 is a wasteful number, since it uses less digits than its factorization.

1986404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235 (or 1233 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1986404 is about 1409.3984532417. The cubic root of 1986404 is about 125.7059574865.

The spelling of 1986404 in words is "one million, nine hundred eighty-six thousand, four hundred four".