2138789431 has 4 divisors (see below), whose sum is σ = 2264600592. Its totient is φ = 2012978272.

The previous prime is 2138789423. The next prime is 2138789449. The reversal of 2138789431 is 1349878312.

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 2138789431 - 2³ = 2138789423 is a prime.

It is a super-2 number, since 2×2138789431² = 9148840460314607522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138789461) 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, 62905555 + ... + 62905588.

It is an arithmetic number, because the mean of its divisors is an integer number (566150148).

Almost surely, 2^2138789431 is an apocalyptic number.

2138789431 is a deficient number, since it is larger than the sum of its proper divisors (125811161).

2138789431 is a wasteful number, since it uses less digits than its factorization.

2138789431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125811160.

The product of its digits is 290304, while the sum is 46.

The square root of 2138789431 is about 46247.0478084818. The cubic root of 2138789431 is about 1288.4157044460.

The spelling of 2138789431 in words is "two billion, one hundred thirty-eight million, seven hundred eighty-nine thousand, four hundred thirty-one".