4043840 has 28 divisors (see below), whose sum is σ = 9630156. Its totient is φ = 1617408.

The previous prime is 4043821. The next prime is 4043869. The reversal of 4043840 is 483404.

It can be written as a sum of positive squares in 2 ways, for example, as 861184 + 3182656 = 928^2 + 1784^2 .

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, 5999 + ... + 6638.

Almost surely, 2^4043840 is an apocalyptic number.

4043840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4043840 is an abundant number, since it is smaller than the sum of its proper divisors (5586316).

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

4043840 is a wasteful number, since it uses less digits than its factorization.

4043840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12654 (or 12644 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 4043840 is about 2010.9301330479. The cubic root of 4043840 is about 159.3179298419.

The spelling of 4043840 in words is "four million, forty-three thousand, eight hundred forty".