19892981 has 4 divisors (see below), whose sum is σ = 20940000. Its totient is φ = 18845964.

The previous prime is 19892969. The next prime is 19892987. The reversal of 19892981 is 18929891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19892981 is a prime.

It is a super-3 number, since 3×19892981³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19892987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523481 + ... + 523518.

It is an arithmetic number, because the mean of its divisors is an integer number (5235000).

Almost surely, 2^19892981 is an apocalyptic number.

It is an amenable number.

19892981 is a deficient number, since it is larger than the sum of its proper divisors (1047019).

19892981 is a wasteful number, since it uses less digits than its factorization.

19892981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047018.

The product of its digits is 93312, while the sum is 47.

The square root of 19892981 is about 4460.1548179407. The cubic root of 19892981 is about 270.9567384181.

The spelling of 19892981 in words is "nineteen million, eight hundred ninety-two thousand, nine hundred eighty-one".