1972159279 has 8 divisors (see below), whose sum is σ = 1988386848. Its totient is φ = 1955984640.

The previous prime is 1972159253. The next prime is 1972159289. The reversal of 1972159279 is 9729512791.

It is a happy number.

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 1972159279 - 2⁵ = 1972159247 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 (1972159289) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 63399 + ... + 89239.

It is an arithmetic number, because the mean of its divisors is an integer number (248548356).

Almost surely, 2^1972159279 is an apocalyptic number.

1972159279 is a deficient number, since it is larger than the sum of its proper divisors (16227569).

1972159279 is a wasteful number, since it uses less digits than its factorization.

1972159279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26465.

The product of its digits is 714420, while the sum is 52.

The square root of 1972159279 is about 44408.9999774820. Note that the first 4 decimals coincide. The cubic root of 1972159279 is about 1254.0475260671.

The spelling of 1972159279 in words is "one billion, nine hundred seventy-two million, one hundred fifty-nine thousand, two hundred seventy-nine".