38861819 has 4 divisors (see below), whose sum is σ = 39498960. Its totient is φ = 38224680.

The previous prime is 38861807. The next prime is 38861833. The reversal of 38861819 is 91816883.

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 38861819 - 2¹² = 38857723 is a prime.

It is a super-2 number, since 2×38861819² = 3020481951977522, which contains 22 as substring.

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 38861819.

It is not an unprimeable number, because it can be changed into a prime (38861869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318479 + ... + 318600.

It is an arithmetic number, because the mean of its divisors is an integer number (9874740).

Almost surely, 2^38861819 is an apocalyptic number.

38861819 is a deficient number, since it is larger than the sum of its proper divisors (637141).

38861819 is an equidigital number, since it uses as much as digits as its factorization.

38861819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637140.

The product of its digits is 82944, while the sum is 44.

The square root of 38861819 is about 6233.9248471569. The cubic root of 38861819 is about 338.7201566825.

The spelling of 38861819 in words is "thirty-eight million, eight hundred sixty-one thousand, eight hundred nineteen".