19971879974 has 8 divisors (see below), whose sum is σ = 29968299648. Its totient is φ = 9982446760.

The previous prime is 19971879971. The next prime is 19971879997. The reversal of 19971879974 is 47997817991.

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 = 19971879898 and 19971879907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19971879971) 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, 1739462 + ... + 1750905.

It is an arithmetic number, because the mean of its divisors is an integer number (3746037456).

Almost surely, 2^19971879974 is an apocalyptic number.

19971879974 is a deficient number, since it is larger than the sum of its proper divisors (9996419674).

19971879974 is a wasteful number, since it uses less digits than its factorization.

19971879974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3493230.

The product of its digits is 72013536, while the sum is 71.

The spelling of 19971879974 in words is "nineteen billion, nine hundred seventy-one million, eight hundred seventy-nine thousand, nine hundred seventy-four".