2139983954 has 8 divisors (see below), whose sum is σ = 3210747660. Its totient is φ = 1069734736.

The previous prime is 2139983933. The next prime is 2139983957. The reversal of 2139983954 is 4593899312.

It can be written as a sum of positive squares in 2 ways, for example, as 1144265929 + 995718025 = 33827^2 + 31555^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2139983896 and 2139983905.

It is not an unprimeable number, because it can be changed into a prime (2139983957) 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, 118049 + ... + 134964.

Almost surely, 2^2139983954 is an apocalyptic number.

2139983954 is a deficient number, since it is larger than the sum of its proper divisors (1070763706).

2139983954 is a wasteful number, since it uses less digits than its factorization.

2139983954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257244.

The product of its digits is 2099520, while the sum is 53.

The square root of 2139983954 is about 46259.9605922876. The cubic root of 2139983954 is about 1288.6555216901.

The spelling of 2139983954 in words is "two billion, one hundred thirty-nine million, nine hundred eighty-three thousand, nine hundred fifty-four".