3998436 has 72 divisors (see below), whose sum is σ = 10753344. Its totient is φ = 1149120.

The previous prime is 3998419. The next prime is 3998459. The reversal of 3998436 is 6348993.

Its product of digits (139968) is a multiple of the sum of its prime divisors (108).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56281 + ... + 56351.

It is an arithmetic number, because the mean of its divisors is an integer number (149352).

Almost surely, 2^3998436 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 3998436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5376672).

3998436 is an abundant number, since it is smaller than the sum of its proper divisors (6754908).

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

3998436 is a wasteful number, since it uses less digits than its factorization.

3998436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 108 counting only the distinct ones).

The product of its digits is 139968, while the sum is 42.

The square root of 3998436 is about 1999.6089617723. The cubic root of 3998436 is about 158.7194133727.

The spelling of 3998436 in words is "three million, nine hundred ninety-eight thousand, four hundred thirty-six".