19974959 has 4 divisors (see below), whose sum is σ = 20002104. Its totient is φ = 19947816.

The previous prime is 19974923. The next prime is 19974967. The reversal of 19974959 is 95947991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19974959 is a prime.

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 19974959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19974259) 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 3 ways as a sum of consecutive naturals, for example, 12437 + ... + 13950.

It is an arithmetic number, because the mean of its divisors is an integer number (5000526).

Almost surely, 2^19974959 is an apocalyptic number.

19974959 is a deficient number, since it is larger than the sum of its proper divisors (27145).

19974959 is an equidigital number, since it uses as much as digits as its factorization.

19974959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27144.

The product of its digits is 918540, while the sum is 53.

The square root of 19974959 is about 4469.3354092080. The cubic root of 19974959 is about 271.3284281273.

The spelling of 19974959 in words is "nineteen million, nine hundred seventy-four thousand, nine hundred fifty-nine".