2139899 has 4 divisors (see below), whose sum is σ = 2208960. Its totient is φ = 2070840.

The previous prime is 2139877. The next prime is 2139911. The reversal of 2139899 is 9989312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2139899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34484 + ... + 34545.

It is an arithmetic number, because the mean of its divisors is an integer number (552240).

2^2139899 is an apocalyptic number.

2139899 is a deficient number, since it is larger than the sum of its proper divisors (69061).

2139899 is an equidigital number, since it uses as much as digits as its factorization.

2139899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69060.

The product of its digits is 34992, while the sum is 41.

The square root of 2139899 is about 1462.8393623361. The cubic root of 2139899 is about 128.8638468931.

The spelling of 2139899 in words is "two million, one hundred thirty-nine thousand, eight hundred ninety-nine".