2138420399 has 4 divisors (see below), whose sum is σ = 2139215400. Its totient is φ = 2137625400.

The previous prime is 2138420381. The next prime is 2138420407. The reversal of 2138420399 is 9930248312.

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 2138420399 - 2¹⁶ = 2138354863 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 (2138420329) 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, 393452 + ... + 398849.

It is an arithmetic number, because the mean of its divisors is an integer number (534803850).

Almost surely, 2^2138420399 is an apocalyptic number.

2138420399 is a deficient number, since it is larger than the sum of its proper divisors (795001).

2138420399 is an equidigital number, since it uses as much as digits as its factorization.

2138420399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795000.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 2138420399 is about 46243.0578465568. The cubic root of 2138420399 is about 1288.3415980433.

The spelling of 2138420399 in words is "two billion, one hundred thirty-eight million, four hundred twenty thousand, three hundred ninety-nine".