38866840 has 64 divisors (see below), whose sum is σ = 91238400. Its totient is φ = 14888832.

The previous prime is 38866819. The next prime is 38866843. The reversal of 38866840 is 4866883.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38866843) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 101289 + ... + 101671.

It is an arithmetic number, because the mean of its divisors is an integer number (1425600).

Almost surely, 2^38866840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38866840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45619200).

38866840 is an abundant number, since it is smaller than the sum of its proper divisors (52371560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38866840 is a wasteful number, since it uses less digits than its factorization.

38866840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 38866840 is about 6234.3275499447. The cubic root of 38866840 is about 338.7347437563.

Adding to 38866840 its sum of digits (43), we get a palindrome (38866883).

The spelling of 38866840 in words is "thirty-eight million, eight hundred sixty-six thousand, eight hundred forty".