1644143 has 2 divisors, whose sum is σ = 1644144. Its totient is φ = 1644142.

The previous prime is 1644103. The next prime is 1644163. The reversal of 1644143 is 3414461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1644143 - 2⁶ = 1644079 is a prime.

It is a super-3 number, since 3×1644143³ = 13333372675804176621, which contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1644103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822071 + 822072.

It is an arithmetic number, because the mean of its divisors is an integer number (822072).

2^1644143 is an apocalyptic number.

1644143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644143 is an equidigital number, since it uses as much as digits as its factorization.

1644143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 1644143 is about 1282.2413969296. The cubic root of 1644143 is about 118.0265907708.

The spelling of 1644143 in words is "one million, six hundred forty-four thousand, one hundred forty-three".