4039840 has 48 divisors (see below), whose sum is σ = 10910592. Its totient is φ = 1384704.

The previous prime is 4039831. The next prime is 4039843. The reversal of 4039840 is 489304.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 4039799 and 4039808.

It is not an unprimeable number, because it can be changed into a prime (4039843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684 + ... + 2923.

It is an arithmetic number, because the mean of its divisors is an integer number (227304).

Almost surely, 2^4039840 is an apocalyptic number.

4039840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4039840 is an abundant number, since it is smaller than the sum of its proper divisors (6870752).

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

4039840 is a wasteful number, since it uses less digits than its factorization.

4039840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3629 (or 3621 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 4039840 is about 2009.9353223425. The cubic root of 4039840 is about 159.2653822670.

The spelling of 4039840 in words is "four million, thirty-nine thousand, eight hundred forty".