2139999 has 8 divisors (see below), whose sum is σ = 2862720. Its totient is φ = 1421976.

The previous prime is 2139979. The next prime is 2140001. The reversal of 2139999 is 9999312.

It is a happy number.

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

It is not a de Polignac number, because 2139999 - 2⁵ = 2139967 is a prime.

2139999 is a modest number, since divided by 9999 gives 213 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 2139999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139919) 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, 84 + ... + 2070.

It is an arithmetic number, because the mean of its divisors is an integer number (357840).

2^2139999 is an apocalyptic number.

2139999 is a deficient number, since it is larger than the sum of its proper divisors (722721).

2139999 is a wasteful number, since it uses less digits than its factorization.

2139999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349.

The product of its digits is 39366, while the sum is 42.

The square root of 2139999 is about 1462.8735420398. The cubic root of 2139999 is about 128.8658541816.

The spelling of 2139999 in words is "two million, one hundred thirty-nine thousand, nine hundred ninety-nine".