19727972407 has 8 divisors (see below), whose sum is σ = 23176918800. Its totient is φ = 16554941760.

The previous prime is 19727972393. The next prime is 19727972431. The reversal of 19727972407 is 70427972791.

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 19727972407 - 2²⁷ = 19593754679 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 (19727972447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68978782 + ... + 68979067.

It is an arithmetic number, because the mean of its divisors is an integer number (2897114850).

Almost surely, 2^19727972407 is an apocalyptic number.

19727972407 is a deficient number, since it is larger than the sum of its proper divisors (3448946393).

19727972407 is a wasteful number, since it uses less digits than its factorization.

19727972407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137957873.

The product of its (nonzero) digits is 3111696, while the sum is 55.

The spelling of 19727972407 in words is "nineteen billion, seven hundred twenty-seven million, nine hundred seventy-two thousand, four hundred seven".