19870389 has 48 divisors (see below), whose sum is σ = 36526464. Its totient is φ = 10108800.

The previous prime is 19870387. The next prime is 19870397. The reversal of 19870389 is 98307891.

It is not a de Polignac number, because 19870389 - 2¹ = 19870387 is a prime.

It is a super-2 number, since 2×19870389² = 789664718022642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19870387) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36459 + ... + 36999.

It is an arithmetic number, because the mean of its divisors is an integer number (760968).

Almost surely, 2^19870389 is an apocalyptic number.

It is an amenable number.

19870389 is a deficient number, since it is larger than the sum of its proper divisors (16656075).

19870389 is a wasteful number, since it uses less digits than its factorization.

19870389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 19870389 is about 4457.6214509534. The cubic root of 19870389 is about 270.8541264562.

The spelling of 19870389 in words is "nineteen million, eight hundred seventy thousand, three hundred eighty-nine".