1600644 has 12 divisors (see below), whose sum is σ = 3734864. Its totient is φ = 533544.

The previous prime is 1600637. The next prime is 1600649. The reversal of 1600644 is 4460061.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1600644² = 5124122429472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1600644.

It is not an unprimeable number, because it can be changed into a prime (1600649) 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, 66682 + ... + 66705.

2^1600644 is an apocalyptic number.

It is an amenable number.

1600644 is an abundant number, since it is smaller than the sum of its proper divisors (2134220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1600644 is a wasteful number, since it uses less digits than its factorization.

1600644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133394 (or 133392 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1600644 is about 1265.1656018087. The cubic root of 1600644 is about 116.9763996521.

The spelling of 1600644 in words is "one million, six hundred thousand, six hundred forty-four".