19942471 has 4 divisors (see below), whose sum is σ = 19951744. Its totient is φ = 19933200.

The previous prime is 19942463. The next prime is 19942487. The reversal of 19942471 is 17424991.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17424991 = 2251 ⋅7741.

It is a cyclic number.

It is not a de Polignac number, because 19942471 - 2³ = 19942463 is a prime.

It is a super-3 number, since 3×19942471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19942471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19942451) 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, 451 + ... + 6331.

It is an arithmetic number, because the mean of its divisors is an integer number (4987936).

Almost surely, 2^19942471 is an apocalyptic number.

19942471 is a deficient number, since it is larger than the sum of its proper divisors (9273).

19942471 is an equidigital number, since it uses as much as digits as its factorization.

19942471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9272.

The product of its digits is 18144, while the sum is 37.

The square root of 19942471 is about 4465.6993853147. The cubic root of 19942471 is about 271.1812488304.

It can be divided in two parts, 1994 and 2471, that added together give a triangular number (4465 = T₉₄).

The spelling of 19942471 in words is "nineteen million, nine hundred forty-two thousand, four hundred seventy-one".