43426639 has 4 divisors (see below), whose sum is σ = 43536424. Its totient is φ = 43316856.

The previous prime is 43426627. The next prime is 43426651. The reversal of 43426639 is 93662434.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93662434 = 2 ⋅46831217.

It is an interprime number because it is at equal distance from previous prime (43426627) and next prime (43426651).

It is a cyclic number.

It is not a de Polignac number, because 43426639 - 2⁹ = 43426127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43426598 and 43426607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43424639) 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, 54297 + ... + 55090.

It is an arithmetic number, because the mean of its divisors is an integer number (10884106).

Almost surely, 2^43426639 is an apocalyptic number.

43426639 is a deficient number, since it is larger than the sum of its proper divisors (109785).

43426639 is a wasteful number, since it uses less digits than its factorization.

43426639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109784.

The product of its digits is 93312, while the sum is 37.

The square root of 43426639 is about 6589.8891492953. The cubic root of 43426639 is about 351.4946664805.

The spelling of 43426639 in words is "forty-three million, four hundred twenty-six thousand, six hundred thirty-nine".