3999456 has 60 divisors (see below), whose sum is σ = 11769912. Its totient is φ = 1332288.

The previous prime is 3999449. The next prime is 3999461. The reversal of 3999456 is 6549993.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1821 + ... + 3363.

Almost surely, 2^3999456 is an apocalyptic number.

3999456 is a gapful number since it is divisible by the number (36) 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 3999456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5884956).

3999456 is an abundant number, since it is smaller than the sum of its proper divisors (7770456).

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

3999456 is a wasteful number, since it uses less digits than its factorization.

3999456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565 (or 1548 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 3999456 is about 1999.8639953757. The cubic root of 3999456 is about 158.7329086525.

The spelling of 3999456 in words is "three million, nine hundred ninety-nine thousand, four hundred fifty-six".