1639143 has 16 divisors (see below), whose sum is σ = 2649600. Its totient is φ = 993240.

The previous prime is 1639097. The next prime is 1639147. The reversal of 1639143 is 3419361.

It is not a de Polignac number, because 1639143 - 2²⁰ = 590567 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2463 + ... + 3056.

It is an arithmetic number, because the mean of its divisors is an integer number (165600).

2^1639143 is an apocalyptic number.

1639143 is a deficient number, since it is larger than the sum of its proper divisors (1010457).

1639143 is a wasteful number, since it uses less digits than its factorization.

1639143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5539 (or 5533 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 1639143 is about 1280.2902014778. The cubic root of 1639143 is about 117.9068258063.

The spelling of 1639143 in words is "one million, six hundred thirty-nine thousand, one hundred forty-three".