38391986 has 4 divisors (see below), whose sum is σ = 57587982. Its totient is φ = 19195992.

The previous prime is 38391971. The next prime is 38392033. The reversal of 38391986 is 68919383.

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

It can be written as a sum of positive squares in only one way, i.e., 25654225 + 12737761 = 5065^2 + 3569^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 38391986.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9597995 + ... + 9597998.

Almost surely, 2^38391986 is an apocalyptic number.

38391986 is a deficient number, since it is larger than the sum of its proper divisors (19195996).

38391986 is a wasteful number, since it uses less digits than its factorization.

38391986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19195995.

The product of its digits is 279936, while the sum is 47.

The square root of 38391986 is about 6196.1266933464. The cubic root of 38391986 is about 337.3495948025.

The spelling of 38391986 in words is "thirty-eight million, three hundred ninety-one thousand, nine hundred eighty-six".