18866930 has 8 divisors (see below), whose sum is σ = 33960492. Its totient is φ = 7546768.

The previous prime is 18866921. The next prime is 18866933. The reversal of 18866930 is 3966881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18037009 + 829921 = 4247^2 + 911^2 .

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

It is a super-2 number, since 2×18866930² = 711922095249800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18866933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943337 + ... + 943356.

Almost surely, 2^18866930 is an apocalyptic number.

18866930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18866930 is a deficient number, since it is larger than the sum of its proper divisors (15093562).

18866930 is a wasteful number, since it uses less digits than its factorization.

18866930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886700.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 18866930 is about 4343.6079473175. The cubic root of 18866930 is about 266.2157501110.

The spelling of 18866930 in words is "eighteen million, eight hundred sixty-six thousand, nine hundred thirty".