19890369 has 12 divisors (see below), whose sum is σ = 29077776. Its totient is φ = 13099992.

The previous prime is 19890347. The next prime is 19890379. The reversal of 19890369 is 96309891.

It is not a de Polignac number, because 19890369 - 2¹⁵ = 19857601 is a prime.

It is a super-2 number, since 2×19890369² = 791253557912322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19890379) 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, 12567 + ... + 14060.

It is an arithmetic number, because the mean of its divisors is an integer number (2423148).

Almost surely, 2^19890369 is an apocalyptic number.

It is an amenable number.

19890369 is a deficient number, since it is larger than the sum of its proper divisors (9187407).

19890369 is a wasteful number, since it uses less digits than its factorization.

19890369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26716 (or 26713 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 19890369 is about 4459.8619933805. The cubic root of 19890369 is about 270.9448787916.

The spelling of 19890369 in words is "nineteen million, eight hundred ninety thousand, three hundred sixty-nine".