2139139 has 4 divisors (see below), whose sum is σ = 2143224. Its totient is φ = 2135056.

The previous prime is 2139131. The next prime is 2139143. The reversal of 2139139 is 9319312.

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

It is a cyclic number.

It is not a de Polignac number, because 2139139 - 2³ = 2139131 is a prime.

It is a super-2 number, since 2×2139139² = 9151831322642, which contains 22 as substring.

It is a Duffinian number.

2139139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2139131) 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, 1117 + ... + 2350.

It is an arithmetic number, because the mean of its divisors is an integer number (535806).

2^2139139 is an apocalyptic number.

2139139 is a deficient number, since it is larger than the sum of its proper divisors (4085).

2139139 is an equidigital number, since it uses as much as digits as its factorization.

2139139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4084.

The product of its digits is 1458, while the sum is 28.

The square root of 2139139 is about 1462.5795704850. The cubic root of 2139139 is about 128.8485894565.

It can be divided in two parts, 2139 and 139, that added together give a triangular number (2278 = T₆₇).

The spelling of 2139139 in words is "two million, one hundred thirty-nine thousand, one hundred thirty-nine".