4240640 has 36 divisors (see below), whose sum is σ = 10160724. Its totient is φ = 1695744.

The previous prime is 4240627. The next prime is 4240661. The reversal of 4240640 is 460424.

It can be written as a sum of positive squares in 2 ways, for example, as 2876416 + 1364224 = 1696^2 + 1168^2 .

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

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, 377 + ... + 2936.

Almost surely, 2^4240640 is an apocalyptic number.

4240640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4240640 is an abundant number, since it is smaller than the sum of its proper divisors (5920084).

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

4240640 is an equidigital number, since it uses as much as digits as its factorization.

4240640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334 (or 3320 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 4240640 is about 2059.2814280715. The cubic root of 4240640 is about 161.8615898513.

The spelling of 4240640 in words is "four million, two hundred forty thousand, six hundred forty".