4387640 has 32 divisors (see below), whose sum is σ = 9936000. Its totient is φ = 1743744.

The previous prime is 4387633. The next prime is 4387661. The reversal of 4387640 is 467834.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 4387597 and 4387606.

It is a congruent number.

It is an unprimeable number.

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, 8921 + ... + 9399.

It is an arithmetic number, because the mean of its divisors is an integer number (310500).

Almost surely, 2^4387640 is an apocalyptic number.

4387640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4387640 is an abundant number, since it is smaller than the sum of its proper divisors (5548360).

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

4387640 is a wasteful number, since it uses less digits than its factorization.

4387640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719 (or 715 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 4387640 is about 2094.6694249929. The cubic root of 4387640 is about 163.7106736942.

The spelling of 4387640 in words is "four million, three hundred eighty-seven thousand, six hundred forty".