19890874 has 8 divisors (see below), whose sum is σ = 29855988. Its totient is φ = 9938880.

The previous prime is 19890859. The next prime is 19890881. The reversal of 19890874 is 47809891.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19580625 + 310249 = 4425^2 + 557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 2674 + ... + 6850.

Almost surely, 2^19890874 is an apocalyptic number.

19890874 is a deficient number, since it is larger than the sum of its proper divisors (9965114).

19890874 is a wasteful number, since it uses less digits than its factorization.

19890874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6560.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 19890874 is about 4459.9186091228. The cubic root of 19890874 is about 270.9471717942.

The spelling of 19890874 in words is "nineteen million, eight hundred ninety thousand, eight hundred seventy-four".