18861226 has 4 divisors (see below), whose sum is σ = 28291842. Its totient is φ = 9430612.

The previous prime is 18861209. The next prime is 18861233. The reversal of 18861226 is 62216881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13315201 + 5546025 = 3649^2 + 2355^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18861191 and 18861200.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4715305 + ... + 4715308.

Almost surely, 2^18861226 is an apocalyptic number.

18861226 is a deficient number, since it is larger than the sum of its proper divisors (9430616).

18861226 is an equidigital number, since it uses as much as digits as its factorization.

18861226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9430615.

The product of its digits is 9216, while the sum is 34.

The square root of 18861226 is about 4342.9513006710. The cubic root of 18861226 is about 266.1889192542.

The spelling of 18861226 in words is "eighteen million, eight hundred sixty-one thousand, two hundred twenty-six".