4020440 has 16 divisors (see below), whose sum is σ = 9046080. Its totient is φ = 1608160.

The previous prime is 4020433. The next prime is 4020461. The reversal of 4020440 is 440204.

It is a congruent 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, 50216 + ... + 50295.

It is an arithmetic number, because the mean of its divisors is an integer number (565380).

Almost surely, 2^4020440 is an apocalyptic number.

4020440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4020440 is an abundant number, since it is smaller than the sum of its proper divisors (5025640).

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

4020440 is a wasteful number, since it uses less digits than its factorization.

4020440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100522 (or 100518 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 4020440 is about 2005.1034886010. The cubic root of 4020440 is about 159.0100332527.

Adding to 4020440 its reverse (440204), we get a palindrome (4460644).

The spelling of 4020440 in words is "four million, twenty thousand, four hundred forty".