18400682 has 4 divisors (see below), whose sum is σ = 27601026. Its totient is φ = 9200340.

The previous prime is 18400673. The next prime is 18400691. The reversal of 18400682 is 28600481.

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 (18400673) and next prime (18400691).

It can be written as a sum of positive squares in only one way, i.e., 14523721 + 3876961 = 3811^2 + 1969^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4600169 + ... + 4600172.

Almost surely, 2^18400682 is an apocalyptic number.

18400682 is a deficient number, since it is larger than the sum of its proper divisors (9200344).

18400682 is an equidigital number, since it uses as much as digits as its factorization.

18400682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9200343.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 18400682 is about 4289.6016132037. The cubic root of 18400682 is about 264.0044860731.

The spelling of 18400682 in words is "eighteen million, four hundred thousand, six hundred eighty-two".