19427971 has 4 divisors (see below), whose sum is σ = 19447344. Its totient is φ = 19408600.

The previous prime is 19427953. The next prime is 19428011. The reversal of 19427971 is 17972491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19427971 - 2⁹ = 19427459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19427911) 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, 8095 + ... + 10216.

It is an arithmetic number, because the mean of its divisors is an integer number (4861836).

Almost surely, 2^19427971 is an apocalyptic number.

19427971 is a deficient number, since it is larger than the sum of its proper divisors (19373).

19427971 is a wasteful number, since it uses less digits than its factorization.

19427971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19372.

The product of its digits is 31752, while the sum is 40.

The square root of 19427971 is about 4407.7172096222. The cubic root of 19427971 is about 268.8288136615.

The spelling of 19427971 in words is "nineteen million, four hundred twenty-seven thousand, nine hundred seventy-one".