1901604 has 24 divisors (see below), whose sum is σ = 4481568. Its totient is φ = 627520.

The previous prime is 1901597. The next prime is 1901639. The reversal of 1901604 is 4061091.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544 + ... + 2024.

It is an arithmetic number, because the mean of its divisors is an integer number (186732).

2^1901604 is an apocalyptic number.

It is an amenable number.

1901604 is an abundant number, since it is smaller than the sum of its proper divisors (2579964).

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

1901604 is a wasteful number, since it uses less digits than its factorization.

1901604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595 (or 1593 counting only the distinct ones).

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

The square root of 1901604 is about 1378.9865844163. The cubic root of 1901604 is about 123.8910767382.

Adding to 1901604 its reverse (4061091), we get a palindrome (5962695).

The spelling of 1901604 in words is "one million, nine hundred one thousand, six hundred four".