4040840 has 16 divisors (see below), whose sum is σ = 9091980. Its totient is φ = 1616320.

The previous prime is 4040833. The next prime is 4040873. The reversal of 4040840 is 480404.

It can be written as a sum of positive squares in 2 ways, for example, as 3378244 + 662596 = 1838^2 + 814^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50471 + ... + 50550.

Almost surely, 2^4040840 is an apocalyptic number.

4040840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4040840 is an abundant number, since it is smaller than the sum of its proper divisors (5051140).

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

4040840 is a wasteful number, since it uses less digits than its factorization.

4040840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101032 (or 101028 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 4040840 is about 2010.1840711736. The cubic root of 4040840 is about 159.2785224114.

The spelling of 4040840 in words is "four million, forty thousand, eight hundred forty".