1972840138 has 8 divisors (see below), whose sum is σ = 2976980832. Its totient is φ = 980513196.

The previous prime is 1972840117. The next prime is 1972840153. The reversal of 1972840138 is 8310482791.

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 = 1972840094 and 1972840103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2953020 + ... + 2953687.

It is an arithmetic number, because the mean of its divisors is an integer number (372122604).

Almost surely, 2^1972840138 is an apocalyptic number.

1972840138 is a deficient number, since it is larger than the sum of its proper divisors (1004140694).

1972840138 is a wasteful number, since it uses less digits than its factorization.

1972840138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5906876.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 1972840138 is about 44416.6650931832. The cubic root of 1972840138 is about 1254.1918232874.

The spelling of 1972840138 in words is "one billion, nine hundred seventy-two million, eight hundred forty thousand, one hundred thirty-eight".