19890106 has 4 divisors (see below), whose sum is σ = 29835162. Its totient is φ = 9945052.

The previous prime is 19890103. The next prime is 19890107. The reversal of 19890106 is 60109891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60109891 = 211 ⋅284881.

It can be written as a sum of positive squares in only one way, i.e., 17564481 + 2325625 = 4191^2 + 1525^2 .

It is not an unprimeable number, because it can be changed into a prime (19890103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972525 + ... + 4972528.

Almost surely, 2^19890106 is an apocalyptic number.

19890106 is a deficient number, since it is larger than the sum of its proper divisors (9945056).

19890106 is an equidigital number, since it uses as much as digits as its factorization.

19890106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9945055.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 19890106 is about 4459.8325080657. The cubic root of 19890106 is about 270.9436845986.

Adding to 19890106 its reverse (60109891), we get a palindrome (79999997).

The spelling of 19890106 in words is "nineteen million, eight hundred ninety thousand, one hundred six".