2138402239 has 4 divisors (see below), whose sum is σ = 2264190624. Its totient is φ = 2012613856.

The previous prime is 2138402219. The next prime is 2138402243. The reversal of 2138402239 is 9322048312.

It is a happy number.

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 2138402239 - 2⁷ = 2138402111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138402209) 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, 62894167 + ... + 62894200.

It is an arithmetic number, because the mean of its divisors is an integer number (566047656).

Almost surely, 2^2138402239 is an apocalyptic number.

2138402239 is a deficient number, since it is larger than the sum of its proper divisors (125788385).

2138402239 is a wasteful number, since it uses less digits than its factorization.

2138402239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125788384.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 2138402239 is about 46242.8614923428. The cubic root of 2138402239 is about 1288.3379510601.

The spelling of 2138402239 in words is "two billion, one hundred thirty-eight million, four hundred two thousand, two hundred thirty-nine".