43626421 has 2 divisors, whose sum is σ = 43626422. Its totient is φ = 43626420.

The previous prime is 43626409. The next prime is 43626463. The reversal of 43626421 is 12462634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43362225 + 264196 = 6585^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 43626421 - 2⁵ = 43626389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43626421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43626721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21813210 + 21813211.

It is an arithmetic number, because the mean of its divisors is an integer number (21813211).

Almost surely, 2^43626421 is an apocalyptic number.

It is an amenable number.

43626421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43626421 is an equidigital number, since it uses as much as digits as its factorization.

43626421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

The square root of 43626421 is about 6605.0299772219. The cubic root of 43626421 is about 352.0328530158.

The spelling of 43626421 in words is "forty-three million, six hundred twenty-six thousand, four hundred twenty-one".