2138686894 has 8 divisors (see below), whose sum is σ = 3248638560. Its totient is φ = 1055807376.

The previous prime is 2138686889. The next prime is 2138686897. The reversal of 2138686894 is 4986868312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138686897) 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, 6767839 + ... + 6768154.

It is an arithmetic number, because the mean of its divisors is an integer number (406079820).

Almost surely, 2^2138686894 is an apocalyptic number.

2138686894 is a deficient number, since it is larger than the sum of its proper divisors (1109951666).

2138686894 is a wasteful number, since it uses less digits than its factorization.

2138686894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13536074.

The product of its digits is 3981312, while the sum is 55.

The square root of 2138686894 is about 46245.9392163247. The cubic root of 2138686894 is about 1288.3951145444.

The spelling of 2138686894 in words is "two billion, one hundred thirty-eight million, six hundred eighty-six thousand, eight hundred ninety-four".