38687820 has 24 divisors (see below), whose sum is σ = 108326064. Its totient is φ = 10316736.

The previous prime is 38687809. The next prime is 38687821. The reversal of 38687820 is 2878683.

It is not an unprimeable number, because it can be changed into a prime (38687821) 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 7 ways as a sum of consecutive naturals, for example, 322339 + ... + 322458.

It is an arithmetic number, because the mean of its divisors is an integer number (4513586).

Almost surely, 2^38687820 is an apocalyptic number.

38687820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

38687820 is an abundant number, since it is smaller than the sum of its proper divisors (69638244).

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

38687820 is a wasteful number, since it uses less digits than its factorization.

38687820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644809 (or 644807 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 38687820 is about 6219.9533760310. The cubic root of 38687820 is about 338.2138744195.

The spelling of 38687820 in words is "thirty-eight million, six hundred eighty-seven thousand, eight hundred twenty".