19974971 has 8 divisors (see below), whose sum is σ = 20957184. Its totient is φ = 19002280.

The previous prime is 19974967. The next prime is 19975003. The reversal of 19974971 is 17947991.

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 19974971 - 2² = 19974967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19974901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2120 + ... + 6666.

It is an arithmetic number, because the mean of its divisors is an integer number (2619648).

Almost surely, 2^19974971 is an apocalyptic number.

19974971 is a deficient number, since it is larger than the sum of its proper divisors (982213).

19974971 is a wasteful number, since it uses less digits than its factorization.

19974971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4761.

The product of its digits is 142884, while the sum is 47.

The square root of 19974971 is about 4469.3367516892. The cubic root of 19974971 is about 271.3284824610.

The spelling of 19974971 in words is "nineteen million, nine hundred seventy-four thousand, nine hundred seventy-one".