1604881 has 4 divisors (see below), whose sum is σ = 1617264. Its totient is φ = 1592500.

The previous prime is 1604857. The next prime is 1604923. The reversal of 1604881 is 1884061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1604881 - 2⁷ = 1604753 is a prime.

It is a super-2 number, since 2×1604881² = 5151286048322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1604821) 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, 5995 + ... + 6256.

It is an arithmetic number, because the mean of its divisors is an integer number (404316).

2^1604881 is an apocalyptic number.

It is an amenable number.

1604881 is a deficient number, since it is larger than the sum of its proper divisors (12383).

1604881 is a wasteful number, since it uses less digits than its factorization.

1604881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12382.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 1604881 is about 1266.8389795077. The cubic root of 1604881 is about 117.0795232131.

It can be divided in two parts, 16048 and 81, that added together give a square (16129 = 127²).

The spelling of 1604881 in words is "one million, six hundred four thousand, eight hundred eighty-one".