1641604 has 6 divisors (see below), whose sum is σ = 2872814. Its totient is φ = 820800.

The previous prime is 1641593. The next prime is 1641613. The reversal of 1641604 is 4061461.

It can be written as a sum of positive squares in only one way, i.e., 1557504 + 84100 = 1248^2 + 290^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205197 + ... + 205204.

2^1641604 is an apocalyptic number.

It is an amenable number.

1641604 is a deficient number, since it is larger than the sum of its proper divisors (1231210).

1641604 is a wasteful number, since it uses less digits than its factorization.

1641604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410405 (or 410403 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1641604 is about 1281.2509512192. The cubic root of 1641604 is about 117.9658045125.

The spelling of 1641604 in words is "one million, six hundred forty-one thousand, six hundred four".