1604290 has 16 divisors (see below), whose sum is σ = 3057912. Its totient is φ = 603904.

The previous prime is 1604279. The next prime is 1604293. The reversal of 1604290 is 924061.

It can be written as a sum of positive squares in 4 ways, for example, as 1481089 + 123201 = 1217^2 + 351^2 .

It is not an unprimeable number, because it can be changed into a prime (1604293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4549 + ... + 4888.

2^1604290 is an apocalyptic number.

1604290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1604290 is a deficient number, since it is larger than the sum of its proper divisors (1453622).

1604290 is a wasteful number, since it uses less digits than its factorization.

1604290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9461.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1604290 is about 1266.6057002872. The cubic root of 1604290 is about 117.0651498746.

The spelling of 1604290 in words is "one million, six hundred four thousand, two hundred ninety".