38447720 has 64 divisors (see below), whose sum is σ = 91584000. Its totient is φ = 14524224.

The previous prime is 38447683. The next prime is 38447741. The reversal of 38447720 is 2774483.

It is an unprimeable number.

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, 486641 + ... + 486719.

It is an arithmetic number, because the mean of its divisors is an integer number (1431000).

Almost surely, 2^38447720 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 38447720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45792000).

38447720 is an abundant number, since it is smaller than the sum of its proper divisors (53136280).

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

38447720 is an equidigital number, since it uses as much as digits as its factorization.

38447720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 38447720 is about 6200.6225493897. The cubic root of 38447720 is about 337.5127603772.

The spelling of 38447720 in words is "thirty-eight million, four hundred forty-seven thousand, seven hundred twenty".