43426640 has 40 divisors (see below), whose sum is σ = 101243520. Its totient is φ = 17323136.

The previous prime is 43426627. The next prime is 43426651. The reversal of 43426640 is 4662434.

It is a happy number.

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

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, 51341 + ... + 52179.

It is an arithmetic number, because the mean of its divisors is an integer number (2531088).

Almost surely, 2^43426640 is an apocalyptic number.

43426640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43426640 is an abundant number, since it is smaller than the sum of its proper divisors (57816880).

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

43426640 is a wasteful number, since it uses less digits than its factorization.

43426640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499 (or 1493 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 43426640 is about 6589.8892251691. The cubic root of 43426640 is about 351.4946691785.

The spelling of 43426640 in words is "forty-three million, four hundred twenty-six thousand, six hundred forty".