1601904 has 40 divisors (see below), whose sum is σ = 4321152. Its totient is φ = 510400.

The previous prime is 1601869. The next prime is 1601953. The reversal of 1601904 is 4091061.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379 + ... + 1829.

2^1601904 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 1601904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2160576).

1601904 is an abundant number, since it is smaller than the sum of its proper divisors (2719248).

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

1601904 is a wasteful number, since it uses less digits than its factorization.

1601904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485 (or 1479 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1601904 is about 1265.6634623785. The cubic root of 1601904 is about 117.0070855523.

Adding to 1601904 its reverse (4091061), we get a palindrome (5692965).

The spelling of 1601904 in words is "one million, six hundred one thousand, nine hundred four".