1604690 has 16 divisors (see below), whose sum is σ = 2967192. Its totient is φ = 624384.

The previous prime is 1604651. The next prime is 1604711. The reversal of 1604690 is 964061.

It can be written as a sum of positive squares in 4 ways, for example, as 1129969 + 474721 = 1063^2 + 689^2 .

It is a super-2 number, since 2×1604690² = 5150059992200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1799 + ... + 2538.

2^1604690 is an apocalyptic number.

1604690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1604690 is a deficient number, since it is larger than the sum of its proper divisors (1362502).

1604690 is a wasteful number, since it uses less digits than its factorization.

1604690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1604690 is about 1266.7635927828. The cubic root of 1604690 is about 117.0748784085.

The spelling of 1604690 in words is "one million, six hundred four thousand, six hundred ninety".