3898720 has 72 divisors (see below), whose sum is σ = 10707984. Its totient is φ = 1314048.

The previous prime is 3898717. The next prime is 3898747. The reversal of 3898720 is 278983.

It is a self number, because there is not a number n which added to its sum of digits gives 3898720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66051 + ... + 66109.

It is an arithmetic number, because the mean of its divisors is an integer number (148722).

Almost surely, 2^3898720 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 3898720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5353992).

3898720 is an abundant number, since it is smaller than the sum of its proper divisors (6809264).

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

3898720 is an equidigital number, since it uses as much as digits as its factorization.

3898720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 3898720 is about 1974.5176626204. The cubic root of 3898720 is about 157.3888692834.

The spelling of 3898720 in words is "three million, eight hundred ninety-eight thousand, seven hundred twenty".