38780172 has 18 divisors (see below), whose sum is σ = 98027748. Its totient is φ = 12926712.

The previous prime is 38780141. The next prime is 38780191. The reversal of 38780172 is 27108783.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1077227 = 38780172 / (3 + 8 + 7 + 8 + 0 + 1 + 7 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 538578 + ... + 538649.

It is an arithmetic number, because the mean of its divisors is an integer number (5445986).

Almost surely, 2^38780172 is an apocalyptic number.

It is an amenable number.

38780172 is an abundant number, since it is smaller than the sum of its proper divisors (59247576).

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

38780172 is a wasteful number, since it uses less digits than its factorization.

38780172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077237 (or 1077232 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 38780172 is about 6227.3728007885. The cubic root of 38780172 is about 338.4827782337.

The spelling of 38780172 in words is "thirty-eight million, seven hundred eighty thousand, one hundred seventy-two".