4047840 has 96 divisors (see below), whose sum is σ = 14182560. Its totient is φ = 1078272.

The previous prime is 4047829. The next prime is 4047847. The reversal of 4047840 is 487404.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4047847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3852 + ... + 4788.

It is an arithmetic number, because the mean of its divisors is an integer number (147735).

Almost surely, 2^4047840 is an apocalyptic number.

4047840 is a gapful number since it is divisible by the number (40) 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 4047840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7091280).

4047840 is an abundant number, since it is smaller than the sum of its proper divisors (10134720).

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

4047840 is a wasteful number, since it uses less digits than its factorization.

4047840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961 (or 947 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 4047840 is about 2011.9244518619. The cubic root of 4047840 is about 159.3704427763.

The spelling of 4047840 in words is "four million, forty-seven thousand, eight hundred forty".