19890011 has 8 divisors (see below), whose sum is σ = 20247264. Its totient is φ = 19535040.

The previous prime is 19890007. The next prime is 19890019. The reversal of 19890011 is 11009891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19890011 - 2² = 19890007 is a prime.

It is a super-2 number, since 2×19890011² = 791225075160242, which contains 22 as substring.

It is a Duffinian number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32141 + ... + 32753.

It is an arithmetic number, because the mean of its divisors is an integer number (2530908).

Almost surely, 2^19890011 is an apocalyptic number.

19890011 is a deficient number, since it is larger than the sum of its proper divisors (357253).

19890011 is an equidigital number, since it uses as much as digits as its factorization.

19890011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 19890011 is about 4459.8218574288. The cubic root of 19890011 is about 270.9432532335.

It can be divided in two parts, 198 and 90011, that added together give a palindrome (90209).

The spelling of 19890011 in words is "nineteen million, eight hundred ninety thousand, eleven".