4018640 has 40 divisors (see below), whose sum is σ = 9427968. Its totient is φ = 1592960.

The previous prime is 4018631. The next prime is 4018643. The reversal of 4018640 is 468104.

It is a happy number.

4018640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×4018640² = 32298934899200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4018643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15149 + ... + 15411.

Almost surely, 2^4018640 is an apocalyptic number.

4018640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4018640 is an abundant number, since it is smaller than the sum of its proper divisors (5409328).

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

4018640 is a wasteful number, since it uses less digits than its factorization.

4018640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 4018640 is about 2004.6545837126. The cubic root of 4018640 is about 158.9862994669.

The spelling of 4018640 in words is "four million, eighteen thousand, six hundred forty".