2158639 has 8 divisors (see below), whose sum is σ = 2489760. Its totient is φ = 1833216.

The previous prime is 2158631. The next prime is 2158649. The reversal of 2158639 is 9368512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2158639 - 2³ = 2158631 is a prime.

2158639 is a lucky number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574 + ... + 2155.

It is an arithmetic number, because the mean of its divisors is an integer number (311220).

2^2158639 is an apocalyptic number.

2158639 is a deficient number, since it is larger than the sum of its proper divisors (331121).

2158639 is a wasteful number, since it uses less digits than its factorization.

2158639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2849.

The product of its digits is 12960, while the sum is 34.

The square root of 2158639 is about 1469.2307511075. The cubic root of 2158639 is about 129.2389258308.

The spelling of 2158639 in words is "two million, one hundred fifty-eight thousand, six hundred thirty-nine".