3998740 has 48 divisors (see below), whose sum is σ = 9374400. Its totient is φ = 1423872.

The previous prime is 3998737. The next prime is 3998741. The reversal of 3998740 is 478993.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3998693 and 3998702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6151 + ... + 6769.

It is an arithmetic number, because the mean of its divisors is an integer number (195300).

Almost surely, 2^3998740 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 3998740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4687200).

3998740 is an abundant number, since it is smaller than the sum of its proper divisors (5375660).

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

3998740 is a wasteful number, since it uses less digits than its factorization.

3998740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 3998740 is about 1999.6849751898. The cubic root of 3998740 is about 158.7234357354.

The spelling of 3998740 in words is "three million, nine hundred ninety-eight thousand, seven hundred forty".