18620138 has 8 divisors (see below), whose sum is σ = 27983460. Its totient is φ = 9292320.

The previous prime is 18620123. The next prime is 18620141. The reversal of 18620138 is 83102681.

It can be written as a sum of positive squares in 2 ways, for example, as 18515809 + 104329 = 4303^2 + 323^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18620138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7523 + ... + 9686.

Almost surely, 2^18620138 is an apocalyptic number.

18620138 is a deficient number, since it is larger than the sum of its proper divisors (9363322).

18620138 is a wasteful number, since it uses less digits than its factorization.

18620138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17752.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18620138 is about 4315.1057924459. The cubic root of 18620138 is about 265.0498921132.

The spelling of 18620138 in words is "eighteen million, six hundred twenty thousand, one hundred thirty-eight".