19890012 has 24 divisors (see below), whose sum is σ = 46576656. Its totient is φ = 6606208.

The previous prime is 19890007. The next prime is 19890019. The reversal of 19890012 is 21009891.

It is a super-2 number, since 2×19890012² = 791225154720288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19890019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688 + ... + 6344.

It is an arithmetic number, because the mean of its divisors is an integer number (1940694).

Almost surely, 2^19890012 is an apocalyptic number.

19890012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19890012 is an abundant number, since it is smaller than the sum of its proper divisors (26686644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19890012 is a wasteful number, since it uses less digits than its factorization.

19890012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5957 (or 5955 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 19890012 is about 4459.8219695409. The cubic root of 19890012 is about 270.9432577742.

The spelling of 19890012 in words is "nineteen million, eight hundred ninety thousand, twelve".