19856974 has 4 divisors (see below), whose sum is σ = 29785464. Its totient is φ = 9928486.

The previous prime is 19856971. The next prime is 19856989. The reversal of 19856974 is 47965891.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19856971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4964242 + ... + 4964245.

It is an arithmetic number, because the mean of its divisors is an integer number (7446366).

Almost surely, 2^19856974 is an apocalyptic number.

19856974 is a deficient number, since it is larger than the sum of its proper divisors (9928490).

19856974 is an equidigital number, since it uses as much as digits as its factorization.

19856974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9928489.

The product of its digits is 544320, while the sum is 49.

The square root of 19856974 is about 4456.1164706502. The cubic root of 19856974 is about 270.7931592534.

The spelling of 19856974 in words is "nineteen million, eight hundred fifty-six thousand, nine hundred seventy-four".