4003940 has 24 divisors (see below), whose sum is σ = 8491392. Its totient is φ = 1585760.

The previous prime is 4003939. The next prime is 4003949. The reversal of 4003940 is 493004.

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

It is not an unprimeable number, because it can be changed into a prime (4003949) 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, 1205 + ... + 3075.

It is an arithmetic number, because the mean of its divisors is an integer number (353808).

Almost surely, 2^4003940 is an apocalyptic number.

It is an amenable number.

4003940 is an abundant number, since it is smaller than the sum of its proper divisors (4487452).

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

4003940 is a wasteful number, since it uses less digits than its factorization.

4003940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987 (or 1985 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 4003940 is about 2000.9847575631. The cubic root of 4003940 is about 158.7922077614.

Adding to 4003940 its reverse (493004), we get a palindrome (4496944).

The spelling of 4003940 in words is "four million, three thousand, nine hundred forty".