2161207838 has 8 divisors (see below), whose sum is σ = 3242010432. Its totient is φ = 1080537696.

The previous prime is 2161207831. The next prime is 2161207843. The reversal of 2161207838 is 8387021612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161207831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39731 + ... + 76817.

It is an arithmetic number, because the mean of its divisors is an integer number (405251304).

Almost surely, 2^2161207838 is an apocalyptic number.

2161207838 is a deficient number, since it is larger than the sum of its proper divisors (1080802594).

2161207838 is a wasteful number, since it uses less digits than its factorization.

2161207838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66226.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 2161207838 is about 46488.7926063906. The cubic root of 2161207838 is about 1292.9017143154.

The spelling of 2161207838 in words is "two billion, one hundred sixty-one million, two hundred seven thousand, eight hundred thirty-eight".