38891986 has 24 divisors (see below), whose sum is σ = 68198220. Its totient is φ = 16585632.

The previous prime is 38891977. The next prime is 38891989. The reversal of 38891986 is 68919883.

It can be written as a sum of positive squares in 2 ways, for example, as 36832761 + 2059225 = 6069^2 + 1435^2 .

It is not an unprimeable number, because it can be changed into a prime (38891989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21576 + ... + 23308.

Almost surely, 2^38891986 is an apocalyptic number.

38891986 is a deficient number, since it is larger than the sum of its proper divisors (29306234).

38891986 is a wasteful number, since it uses less digits than its factorization.

38891986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978 (or 1971 counting only the distinct ones).

The product of its digits is 746496, while the sum is 52.

The square root of 38891986 is about 6236.3439610079. The cubic root of 38891986 is about 338.8077793446.

The spelling of 38891986 in words is "thirty-eight million, eight hundred ninety-one thousand, nine hundred eighty-six".