18866842 has 4 divisors (see below), whose sum is σ = 28300266. Its totient is φ = 9433420.

The previous prime is 18866833. The next prime is 18866851. The reversal of 18866842 is 24866881.

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

It is an interprime number because it is at equal distance from previous prime (18866833) and next prime (18866851).

It can be written as a sum of positive squares in only one way, i.e., 13111641 + 5755201 = 3621^2 + 2399^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4716709 + ... + 4716712.

Almost surely, 2^18866842 is an apocalyptic number.

18866842 is a deficient number, since it is larger than the sum of its proper divisors (9433424).

18866842 is an equidigital number, since it uses as much as digits as its factorization.

18866842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9433423.

The product of its digits is 147456, while the sum is 43.

The square root of 18866842 is about 4343.5978174780. The cubic root of 18866842 is about 266.2153362118.

The spelling of 18866842 in words is "eighteen million, eight hundred sixty-six thousand, eight hundred forty-two".