2138218747 has 8 divisors (see below), whose sum is σ = 2478097152. Its totient is φ = 1806945000.

The previous prime is 2138218727. The next prime is 2138218763. The reversal of 2138218747 is 7478128312.

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

It is a de Polignac number, because none of the positive numbers 2^k-2138218747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138218717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2150629 + ... + 2151622.

It is an arithmetic number, because the mean of its divisors is an integer number (309762144).

Almost surely, 2^2138218747 is an apocalyptic number.

2138218747 is a deficient number, since it is larger than the sum of its proper divisors (339878405).

2138218747 is an equidigital number, since it uses as much as digits as its factorization.

2138218747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4302329.

The product of its digits is 150528, while the sum is 43.

The square root of 2138218747 is about 46240.8774462596. The cubic root of 2138218747 is about 1288.3011001090.

The spelling of 2138218747 in words is "two billion, one hundred thirty-eight million, two hundred eighteen thousand, seven hundred forty-seven".