18689026 has 4 divisors (see below), whose sum is σ = 28033542. Its totient is φ = 9344512.

The previous prime is 18689023. The next prime is 18689051. The reversal of 18689026 is 62098681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62098681 = 157 ⋅395533.

It can be written as a sum of positive squares in only one way, i.e., 13329801 + 5359225 = 3651^2 + 2315^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18689026.

It is not an unprimeable number, because it can be changed into a prime (18689023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4672255 + ... + 4672258.

Almost surely, 2^18689026 is an apocalyptic number.

18689026 is a deficient number, since it is larger than the sum of its proper divisors (9344516).

18689026 is an equidigital number, since it uses as much as digits as its factorization.

18689026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9344515.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 18689026 is about 4323.0806145618. The cubic root of 18689026 is about 265.3763538206.

The spelling of 18689026 in words is "eighteen million, six hundred eighty-nine thousand, twenty-six".