1801664 has 14 divisors (see below), whose sum is σ = 3575304. Its totient is φ = 900800.

The previous prime is 1801619. The next prime is 1801669. The reversal of 1801664 is 4661081.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14012 + ... + 14139.

2^1801664 is an apocalyptic number.

It is an amenable number.

1801664 is a deficient number, since it is larger than the sum of its proper divisors (1773640).

1801664 is an equidigital number, since it uses as much as digits as its factorization.

1801664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28163 (or 28153 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1801664 is about 1342.2607794315. The cubic root of 1801664 is about 121.6815127523.

The spelling of 1801664 in words is "one million, eight hundred one thousand, six hundred sixty-four".