3999240 has 192 divisors, whose sum is σ = 15926400. Its totient is φ = 874368.

The previous prime is 3999239. The next prime is 3999251. The reversal of 3999240 is 429993.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 3999195 and 3999204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 173869 + ... + 173891.

It is an arithmetic number, because the mean of its divisors is an integer number (82950).

Almost surely, 2^3999240 is an apocalyptic number.

3999240 is a gapful number since it is divisible by the number (30) 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 3999240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7963200).

3999240 is an abundant number, since it is smaller than the sum of its proper divisors (11927160).

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

3999240 is a wasteful number, since it uses less digits than its factorization.

3999240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 3999240 is about 1999.8099909741. The cubic root of 3999240 is about 158.7300510200.

The spelling of 3999240 in words is "three million, nine hundred ninety-nine thousand, two hundred forty".