2139699 has 4 divisors (see below), whose sum is σ = 2852936. Its totient is φ = 1426464.

The previous prime is 2139691. The next prime is 2139733. The reversal of 2139699 is 9969312.

It is a happy number.

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

It is not a de Polignac number, because 2139699 - 2³ = 2139691 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139691) 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, 356614 + ... + 356619.

It is an arithmetic number, because the mean of its divisors is an integer number (713234).

2^2139699 is an apocalyptic number.

2139699 is a deficient number, since it is larger than the sum of its proper divisors (713237).

2139699 is an equidigital number, since it uses as much as digits as its factorization.

2139699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713236.

The product of its digits is 26244, while the sum is 39.

The square root of 2139699 is about 1462.7710005329. The cubic root of 2139699 is about 128.8598321285.

The spelling of 2139699 in words is "two million, one hundred thirty-nine thousand, six hundred ninety-nine".