1939904 has 28 divisors (see below), whose sum is σ = 4078224. Its totient is φ = 912384.

The previous prime is 1939901. The next prime is 1939909. The reversal of 1939904 is 4099391.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1939901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197 + ... + 1979.

2^1939904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1939904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2039112).

1939904 is an abundant number, since it is smaller than the sum of its proper divisors (2138320).

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

1939904 is a wasteful number, since it uses less digits than its factorization.

1939904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812 (or 1802 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1939904 is about 1392.8043653005. The cubic root of 1939904 is about 124.7173131872.

The spelling of 1939904 in words is "one million, nine hundred thirty-nine thousand, nine hundred four".