19020989 has 4 divisors (see below), whose sum is σ = 20484156. Its totient is φ = 17557824.

The previous prime is 19020961. The next prime is 19021039. The reversal of 19020989 is 98902091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1085764 + 17935225 = 1042^2 + 4235^2 .

It is a cyclic number.

It is not a de Polignac number, because 19020989 - 2⁸ = 19020733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19020689) 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 3 ways as a sum of consecutive naturals, for example, 731564 + ... + 731589.

It is an arithmetic number, because the mean of its divisors is an integer number (5121039).

Almost surely, 2^19020989 is an apocalyptic number.

It is an amenable number.

19020989 is a deficient number, since it is larger than the sum of its proper divisors (1463167).

19020989 is a wasteful number, since it uses less digits than its factorization.

19020989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463166.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 19020989 is about 4361.3058824164. The cubic root of 19020989 is about 266.9383867520.

The spelling of 19020989 in words is "nineteen million, twenty thousand, nine hundred eighty-nine".