387638018 has 4 divisors (see below), whose sum is σ = 581457030. Its totient is φ = 193819008.

The previous prime is 387637993. The next prime is 387638033. The reversal of 387638018 is 810836783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 810836783 = 20663 ⋅39241.

It can be written as a sum of positive squares in only one way, i.e., 341030089 + 46607929 = 18467^2 + 6827^2 .

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 387638018.

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 as a sum of consecutive naturals, namely, 96909503 + ... + 96909506.

Almost surely, 2^387638018 is an apocalyptic number.

387638018 is a deficient number, since it is larger than the sum of its proper divisors (193819012).

387638018 is a wasteful number, since it uses less digits than its factorization.

387638018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193819011.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 387638018 is about 19688.5250336332. The cubic root of 387638018 is about 729.1364142021.

The spelling of 387638018 in words is "three hundred eighty-seven million, six hundred thirty-eight thousand, eighteen".