19890874649 has 8 divisors (see below), whose sum is σ = 19920903552. Its totient is φ = 19860870960.

The previous prime is 19890874643. The next prime is 19890874673. The reversal of 19890874649 is 94647809891.

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

It is a cyclic number.

It is not a de Polignac number, because 19890874649 - 2²⁴ = 19874097433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19890874643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2038787 + ... + 2048519.

It is an arithmetic number, because the mean of its divisors is an integer number (2490112944).

Almost surely, 2^19890874649 is an apocalyptic number.

It is an amenable number.

19890874649 is a deficient number, since it is larger than the sum of its proper divisors (30028903).

19890874649 is a wasteful number, since it uses less digits than its factorization.

19890874649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12607.

The product of its (nonzero) digits is 31352832, while the sum is 65.

The spelling of 19890874649 in words is "nineteen billion, eight hundred ninety million, eight hundred seventy-four thousand, six hundred forty-nine".