38663999 has 4 divisors (see below), whose sum is σ = 42178920. Its totient is φ = 35149080.

The previous prime is 38663983. The next prime is 38664011. The reversal of 38663999 is 99936683.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 38663999 - 2⁴ = 38663983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38663999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38663959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1757444 + ... + 1757465.

It is an arithmetic number, because the mean of its divisors is an integer number (10544730).

Almost surely, 2^38663999 is an apocalyptic number.

38663999 is a deficient number, since it is larger than the sum of its proper divisors (3514921).

38663999 is a wasteful number, since it uses less digits than its factorization.

38663999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514920.

The product of its digits is 1889568, while the sum is 53.

The square root of 38663999 is about 6218.0381954440. The cubic root of 38663999 is about 338.1444447574.

The spelling of 38663999 in words is "thirty-eight million, six hundred sixty-three thousand, nine hundred ninety-nine".