1644057 has 10 divisors (see below), whose sum is σ = 2456058. Its totient is φ = 1095984.

The previous prime is 1644031. The next prime is 1644061. The reversal of 1644057 is 7504461.

It can be written as a sum of positive squares in only one way, i.e., 1390041 + 254016 = 1179^2 + 504^2 .

It is not a de Polignac number, because 1644057 - 2⁸ = 1643801 is a prime.

It is a super-3 number, since 3×1644057³ = 13331280503640759579, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1644057.

It is not an unprimeable number, because it can be changed into a prime (1644067) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10068 + ... + 10229.

2^1644057 is an apocalyptic number.

It is an amenable number.

1644057 is a deficient number, since it is larger than the sum of its proper divisors (812001).

1644057 is an equidigital number, since it uses as much as digits as its factorization.

1644057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20309 (or 20300 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 1644057 is about 1282.2078614640. The cubic root of 1644057 is about 118.0245328671.

The spelling of 1644057 in words is "one million, six hundred forty-four thousand, fifty-seven".