3999540 has 48 divisors (see below), whose sum is σ = 11289600. Its totient is φ = 1057920.

The previous prime is 3999529. The next prime is 3999547. The reversal of 3999540 is 459993.

It is a happy number.

3999540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11286 + ... + 11634.

It is an arithmetic number, because the mean of its divisors is an integer number (235200).

Almost surely, 2^3999540 is an apocalyptic number.

3999540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3999540 is an abundant number, since it is smaller than the sum of its proper divisors (7290060).

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

3999540 is a wasteful number, since it uses less digits than its factorization.

3999540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 3999540 is about 1999.8849966936. The cubic root of 3999540 is about 158.7340199262.

The spelling of 3999540 in words is "three million, nine hundred ninety-nine thousand, five hundred forty".