2139643 has 6 divisors (see below), whose sum is σ = 2351972. Its totient is φ = 1945020.

The previous prime is 2139611. The next prime is 2139653. The reversal of 2139643 is 3469312.

It is not a de Polignac number, because 2139643 - 2⁵ = 2139611 is a prime.

It is a Duffinian number.

2139643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2139653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8721 + ... + 8962.

2^2139643 is an apocalyptic number.

2139643 is a deficient number, since it is larger than the sum of its proper divisors (212329).

2139643 is a wasteful number, since it uses less digits than its factorization.

2139643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17705 (or 17694 counting only the distinct ones).

The product of its digits is 3888, while the sum is 28.

The square root of 2139643 is about 1462.7518586555. The cubic root of 2139643 is about 128.8587079496.

The spelling of 2139643 in words is "two million, one hundred thirty-nine thousand, six hundred forty-three".