18400706 has 8 divisors (see below), whose sum is σ = 27885900. Its totient is φ = 9105408.

The previous prime is 18400691. The next prime is 18400717. The reversal of 18400706 is 60700481.

It can be written as a sum of positive squares in 2 ways, for example, as 16687225 + 1713481 = 4085^2 + 1309^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47231 + ... + 47618.

Almost surely, 2^18400706 is an apocalyptic number.

18400706 is a deficient number, since it is larger than the sum of its proper divisors (9485194).

18400706 is an equidigital number, since it uses as much as digits as its factorization.

18400706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94948.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 18400706 is about 4289.6044106654. The cubic root of 18400706 is about 264.0046008534.

The spelling of 18400706 in words is "eighteen million, four hundred thousand, seven hundred six".