38721420 has 144 divisors (see below), whose sum is σ = 125798400. Its totient is φ = 9618048.

The previous prime is 38721413. The next prime is 38721421. The reversal of 38721420 is 2412783.

It is not an unprimeable number, because it can be changed into a prime (38721421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 194481 + ... + 194679.

It is an arithmetic number, because the mean of its divisors is an integer number (873600).

Almost surely, 2^38721420 is an apocalyptic number.

38721420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38721420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62899200).

38721420 is an abundant number, since it is smaller than the sum of its proper divisors (87076980).

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

38721420 is a wasteful number, since it uses less digits than its factorization.

38721420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 38721420 is about 6222.6537747170. The cubic root of 38721420 is about 338.3117579216.

The spelling of 38721420 in words is "thirty-eight million, seven hundred twenty-one thousand, four hundred twenty".