19974999 has 16 divisors (see below), whose sum is σ = 29533824. Its totient is φ = 11906400.

The previous prime is 19974967. The next prime is 19975003. The reversal of 19974999 is 99947991.

It is not a de Polignac number, because 19974999 - 2⁵ = 19974967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19974299) 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 15 ways as a sum of consecutive naturals, for example, 2949 + ... + 6974.

It is an arithmetic number, because the mean of its divisors is an integer number (1845864).

Almost surely, 2^19974999 is an apocalyptic number.

19974999 is a deficient number, since it is larger than the sum of its proper divisors (9558825).

19974999 is a wasteful number, since it uses less digits than its factorization.

19974999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9998.

The product of its digits is 1653372, while the sum is 57.

The square root of 19974999 is about 4469.3398841440. The cubic root of 19974999 is about 271.3286092396.

It can be divided in two parts, 1997 and 4999, that added together give a palindrome (6996).

The spelling of 19974999 in words is "nineteen million, nine hundred seventy-four thousand, nine hundred ninety-nine".