19959489 has 12 divisors (see below), whose sum is σ = 31451472. Its totient is φ = 12096600.

The previous prime is 19959487. The next prime is 19959503. The reversal of 19959489 is 98495991.

It is not a de Polignac number, because 19959489 - 2¹ = 19959487 is a prime.

It is a super-2 number, since 2×19959489² = 796762402282242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19959487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100707 + ... + 100904.

It is an arithmetic number, because the mean of its divisors is an integer number (2620956).

Almost surely, 2^19959489 is an apocalyptic number.

It is an amenable number.

19959489 is a deficient number, since it is larger than the sum of its proper divisors (11491983).

19959489 is a wasteful number, since it uses less digits than its factorization.

19959489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201628 (or 201625 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 19959489 is about 4467.6043916175. The cubic root of 19959489 is about 271.2583648238.

The spelling of 19959489 in words is "nineteen million, nine hundred fifty-nine thousand, four hundred eighty-nine".