43406687 has 4 divisors (see below), whose sum is σ = 44054616. Its totient is φ = 42758760.

The previous prime is 43406653. The next prime is 43406689. The reversal of 43406687 is 78660434.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78660434 = 2 ⋅39330217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43406687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43406687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43406689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323864 + ... + 323997.

It is an arithmetic number, because the mean of its divisors is an integer number (11013654).

Almost surely, 2^43406687 is an apocalyptic number.

43406687 is a deficient number, since it is larger than the sum of its proper divisors (647929).

43406687 is an equidigital number, since it uses as much as digits as its factorization.

43406687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647928.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 43406687 is about 6588.3751411103. The cubic root of 43406687 is about 351.4408278226.

The spelling of 43406687 in words is "forty-three million, four hundred six thousand, six hundred eighty-seven".