1604491 has 4 divisors (see below), whose sum is σ = 1833712. Its totient is φ = 1375272.

The previous prime is 1604479. The next prime is 1604497. The reversal of 1604491 is 1944061.

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

It is a cyclic number.

It is not a de Polignac number, because 1604491 - 2¹³ = 1596299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1604497) 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, 114600 + ... + 114613.

It is an arithmetic number, because the mean of its divisors is an integer number (458428).

2^1604491 is an apocalyptic number.

1604491 is a deficient number, since it is larger than the sum of its proper divisors (229221).

1604491 is an equidigital number, since it uses as much as digits as its factorization.

1604491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229220.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1604491 is about 1266.6850437263. The cubic root of 1604491 is about 117.0700386650.

The spelling of 1604491 in words is "one million, six hundred four thousand, four hundred ninety-one".