1985904 has 40 divisors (see below), whose sum is σ = 5701520. Its totient is φ = 661824.

The previous prime is 1985903. The next prime is 1985939. The reversal of 1985904 is 4095891.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1867 + ... + 2730.

It is an arithmetic number, because the mean of its divisors is an integer number (142538).

2^1985904 is an apocalyptic number.

It is an amenable number.

1985904 is an abundant number, since it is smaller than the sum of its proper divisors (3715616).

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

1985904 is a wasteful number, since it uses less digits than its factorization.

1985904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4614 (or 4602 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1985904 is about 1409.2210614378. The cubic root of 1985904 is about 125.6954094051.

The spelling of 1985904 in words is "one million, nine hundred eighty-five thousand, nine hundred four".