4386640 has 20 divisors (see below), whose sum is σ = 10199124. Its totient is φ = 1754624.

The previous prime is 4386637. The next prime is 4386647. The reversal of 4386640 is 466834.

It can be written as a sum of positive squares in 2 ways, for example, as 1915456 + 2471184 = 1384^2 + 1572^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×4386640² = 38485220979200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4386647) 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 3 ways as a sum of consecutive naturals, for example, 27337 + ... + 27496.

Almost surely, 2^4386640 is an apocalyptic number.

4386640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4386640 is an abundant number, since it is smaller than the sum of its proper divisors (5812484).

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

4386640 is a wasteful number, since it uses less digits than its factorization.

4386640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54846 (or 54840 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 4386640 is about 2094.4307102409. The cubic root of 4386640 is about 163.6982354881.

The spelling of 4386640 in words is "four million, three hundred eighty-six thousand, six hundred forty".