2138648937 has 4 divisors (see below), whose sum is σ = 2851531920. Its totient is φ = 1425765956.

The previous prime is 2138648917. The next prime is 2138648969. The reversal of 2138648937 is 7398468312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2138648937 - 2¹⁴ = 2138632553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2138648937.

It is not an unprimeable number, because it can be changed into a prime (2138648917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356441487 + ... + 356441492.

It is an arithmetic number, because the mean of its divisors is an integer number (712882980).

Almost surely, 2^2138648937 is an apocalyptic number.

It is an amenable number.

2138648937 is a deficient number, since it is larger than the sum of its proper divisors (712882983).

2138648937 is an equidigital number, since it uses as much as digits as its factorization.

2138648937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712882982.

The product of its digits is 1741824, while the sum is 51.

The square root of 2138648937 is about 46245.5288325261. The cubic root of 2138648937 is about 1288.3874924371.

The spelling of 2138648937 in words is "two billion, one hundred thirty-eight million, six hundred forty-eight thousand, nine hundred thirty-seven".