18706426 has 8 divisors (see below), whose sum is σ = 29710260. Its totient is φ = 8803008.

The previous prime is 18706411. The next prime is 18706427. The reversal of 18706426 is 62460781.

It can be written as a sum of positive squares in 2 ways, for example, as 17264025 + 1442401 = 4155^2 + 1201^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 550189 = 18706426 / (1 + 8 + 7 + 0 + 6 + 4 + 2 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 18706391 and 18706400.

It is not an unprimeable number, because it can be changed into a prime (18706427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275061 + ... + 275128.

Almost surely, 2^18706426 is an apocalyptic number.

18706426 is a deficient number, since it is larger than the sum of its proper divisors (11003834).

18706426 is a wasteful number, since it uses less digits than its factorization.

18706426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550208.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 18706426 is about 4325.0926001648. The cubic root of 18706426 is about 265.4586858493.

The spelling of 18706426 in words is "eighteen million, seven hundred six thousand, four hundred twenty-six".