38421728 has 12 divisors (see below), whose sum is σ = 75642840. Its totient is φ = 19210848.

The previous prime is 38421727. The next prime is 38421731. The reversal of 38421728 is 82712483.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38421727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600308 + ... + 600371.

It is an arithmetic number, because the mean of its divisors is an integer number (6303570).

Almost surely, 2^38421728 is an apocalyptic number.

It is an amenable number.

38421728 is a deficient number, since it is larger than the sum of its proper divisors (37221112).

38421728 is a wasteful number, since it uses less digits than its factorization.

38421728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200689 (or 1200681 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 38421728 is about 6198.5262764628. The cubic root of 38421728 is about 337.4366864316.

The spelling of 38421728 in words is "thirty-eight million, four hundred twenty-one thousand, seven hundred twenty-eight".