2138421779 has 8 divisors (see below), whose sum is σ = 2328792480. Its totient is φ = 1951747776.

The previous prime is 2138421751. The next prime is 2138421787. The reversal of 2138421779 is 9771248312.

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

It is a cyclic number.

It is not a de Polignac number, because 2138421779 - 2¹² = 2138417683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138421479) 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, 922967 + ... + 925280.

It is an arithmetic number, because the mean of its divisors is an integer number (291099060).

Almost surely, 2^2138421779 is an apocalyptic number.

2138421779 is a deficient number, since it is larger than the sum of its proper divisors (190370701).

2138421779 is a wasteful number, since it uses less digits than its factorization.

2138421779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848349.

The product of its digits is 169344, while the sum is 44.

The square root of 2138421779 is about 46243.0727677130. The cubic root of 2138421779 is about 1288.3418751810.

The spelling of 2138421779 in words is "two billion, one hundred thirty-eight million, four hundred twenty-one thousand, seven hundred seventy-nine".