38686440 has 64 divisors (see below), whose sum is σ = 124992000. Its totient is φ = 9522432.

The previous prime is 38686429. The next prime is 38686463. The reversal of 38686440 is 4468683.

38686440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10840 + ... + 13959.

It is an arithmetic number, because the mean of its divisors is an integer number (1953000).

Almost surely, 2^38686440 is an apocalyptic number.

38686440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

38686440 is an abundant number, since it is smaller than the sum of its proper divisors (86305560).

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

38686440 is a wasteful number, since it uses less digits than its factorization.

38686440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24826 (or 24822 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 38686440 is about 6219.8424417344. The cubic root of 38686440 is about 338.2098529928.

The spelling of 38686440 in words is "thirty-eight million, six hundred eighty-six thousand, four hundred forty".