19621389 has 8 divisors (see below), whose sum is σ = 26329120. Its totient is φ = 12997296.

The previous prime is 19621367. The next prime is 19621403. The reversal of 19621389 is 98312691.

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

It is not a de Polignac number, because 19621389 - 2⁹ = 19620877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19620389) 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, 20359 + ... + 21300.

It is an arithmetic number, because the mean of its divisors is an integer number (3291140).

Almost surely, 2^19621389 is an apocalyptic number.

It is an amenable number.

19621389 is a deficient number, since it is larger than the sum of its proper divisors (6707731).

19621389 is a wasteful number, since it uses less digits than its factorization.

19621389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41819.

The product of its digits is 23328, while the sum is 39.

The square root of 19621389 is about 4429.6037068794. The cubic root of 19621389 is about 269.7179908725.

The spelling of 19621389 in words is "nineteen million, six hundred twenty-one thousand, three hundred eighty-nine".