1604261 has 4 divisors (see below), whose sum is σ = 1618572. Its totient is φ = 1589952.

The previous prime is 1604243. The next prime is 1604263. The reversal of 1604261 is 1624061.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 828100 + 776161 = 910^2 + 881^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604261 - 2¹⁰ = 1603237 is a prime.

It is a super-2 number, since 2×1604261² = 5147306712242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604263) 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 3 ways as a sum of consecutive naturals, for example, 6986 + ... + 7211.

It is an arithmetic number, because the mean of its divisors is an integer number (404643).

2^1604261 is an apocalyptic number.

It is an amenable number.

1604261 is a deficient number, since it is larger than the sum of its proper divisors (14311).

1604261 is a wasteful number, since it uses less digits than its factorization.

1604261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14310.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1604261 is about 1266.5942523160. The cubic root of 1604261 is about 117.0644444931.

The spelling of 1604261 in words is "one million, six hundred four thousand, two hundred sixty-one".