19981359 has 6 divisors (see below), whose sum is σ = 28861976. Its totient is φ = 13320900.

The previous prime is 19981333. The next prime is 19981361. The reversal of 19981359 is 95318991.

It is not a de Polignac number, because 19981359 - 2⁷ = 19981231 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 (19981399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1110067 + ... + 1110084.

Almost surely, 2^19981359 is an apocalyptic number.

19981359 is a deficient number, since it is larger than the sum of its proper divisors (8880617).

19981359 is a wasteful number, since it uses less digits than its factorization.

19981359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220157 (or 2220154 counting only the distinct ones).

The product of its digits is 87480, while the sum is 45.

The square root of 19981359 is about 4470.0513419870. The cubic root of 19981359 is about 271.3574030139.

The spelling of 19981359 in words is "nineteen million, nine hundred eighty-one thousand, three hundred fifty-nine".