19936889 has 4 divisors (see below), whose sum is σ = 22785024. Its totient is φ = 17088756.

The previous prime is 19936879. The next prime is 19936897. The reversal of 19936889 is 98863991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98863991 = 31 ⋅3189161.

It is a cyclic number.

It is not a de Polignac number, because 19936889 - 2⁸ = 19936633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19936889.

It is not an unprimeable number, because it can be changed into a prime (19936859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1424057 + ... + 1424070.

It is an arithmetic number, because the mean of its divisors is an integer number (5696256).

Almost surely, 2^19936889 is an apocalyptic number.

It is an amenable number.

19936889 is a deficient number, since it is larger than the sum of its proper divisors (2848135).

19936889 is an equidigital number, since it uses as much as digits as its factorization.

19936889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2848134.

The product of its digits is 839808, while the sum is 53.

The square root of 19936889 is about 4465.0743554839. The cubic root of 19936889 is about 271.1559447949.

The spelling of 19936889 in words is "nineteen million, nine hundred thirty-six thousand, eight hundred eighty-nine".