38639172 has 144 divisors (see below), whose sum is σ = 112613760. Its totient is φ = 10222080.

The previous prime is 38639143. The next prime is 38639177. The reversal of 38639172 is 27193683.

It is a super-2 number, since 2×38639172² = 2985971225691168, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 38639172.

It is not an unprimeable number, because it can be changed into a prime (38639177) 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 47 ways as a sum of consecutive naturals, for example, 434104 + ... + 434192.

It is an arithmetic number, because the mean of its divisors is an integer number (782040).

Almost surely, 2^38639172 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 38639172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56306880).

38639172 is an abundant number, since it is smaller than the sum of its proper divisors (73974588).

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

38639172 is a wasteful number, since it uses less digits than its factorization.

38639172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 141 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 38639172 is about 6216.0415056529. The cubic root of 38639172 is about 338.0720526107.

The spelling of 38639172 in words is "thirty-eight million, six hundred thirty-nine thousand, one hundred seventy-two".