1644164 has 6 divisors (see below), whose sum is σ = 2877294. Its totient is φ = 822080.

The previous prime is 1644163. The next prime is 1644173. The reversal of 1644164 is 4614461.

It can be written as a sum of positive squares in only one way, i.e., 1459264 + 184900 = 1208^2 + 430^2 .

It is a super-3 number, since 3×1644164³ = 13333883588302448832, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1644163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205517 + ... + 205524.

It is an arithmetic number, because the mean of its divisors is an integer number (479549).

2^1644164 is an apocalyptic number.

It is an amenable number.

1644164 is a deficient number, since it is larger than the sum of its proper divisors (1233130).

1644164 is a wasteful number, since it uses less digits than its factorization.

1644164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411045 (or 411043 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 1644164 is about 1282.2495856892. The cubic root of 1644164 is about 118.0270932713.

The spelling of 1644164 in words is "one million, six hundred forty-four thousand, one hundred sixty-four".