1604291 has 4 divisors (see below), whose sum is σ = 1727712. Its totient is φ = 1480872.

The previous prime is 1604279. The next prime is 1604293. The reversal of 1604291 is 1924061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1924061 = 73 ⋅26357.

It is a cyclic number.

It is not a de Polignac number, because 1604291 - 2¹⁰ = 1603267 is a prime.

It is a super-2 number, since 2×1604291² = 5147499225362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1604293) 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, 61691 + ... + 61716.

It is an arithmetic number, because the mean of its divisors is an integer number (431928).

2^1604291 is an apocalyptic number.

1604291 is a deficient number, since it is larger than the sum of its proper divisors (123421).

1604291 is a wasteful number, since it uses less digits than its factorization.

1604291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123420.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1604291 is about 1266.6060950430. The cubic root of 1604291 is about 117.0651741980.

The spelling of 1604291 in words is "one million, six hundred four thousand, two hundred ninety-one".