2138604959 has 4 divisors (see below), whose sum is σ = 2170524504. Its totient is φ = 2106685416.

The previous prime is 2138604899. The next prime is 2138604973. The reversal of 2138604959 is 9594068312.

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 2138604959 - 2²⁰ = 2137556383 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 (2138604989) 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, 15959672 + ... + 15959805.

It is an arithmetic number, because the mean of its divisors is an integer number (542631126).

Almost surely, 2^2138604959 is an apocalyptic number.

2138604959 is a deficient number, since it is larger than the sum of its proper divisors (31919545).

2138604959 is an equidigital number, since it uses as much as digits as its factorization.

2138604959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31919544.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 2138604959 is about 46245.0533462769. The cubic root of 2138604959 is about 1288.3786611461.

The spelling of 2138604959 in words is "two billion, one hundred thirty-eight million, six hundred four thousand, nine hundred fifty-nine".