43426781 has 4 divisors (see below), whose sum is σ = 43564092. Its totient is φ = 43289472.

The previous prime is 43426777. The next prime is 43426807. The reversal of 43426781 is 18762434.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21252100 + 22174681 = 4610^2 + 4709^2 .

It is a cyclic number.

It is not a de Polignac number, because 43426781 - 2² = 43426777 is a prime.

It is a super-2 number, since 2×43426781² = 3771770616043922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43426711) 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, 68180 + ... + 68813.

It is an arithmetic number, because the mean of its divisors is an integer number (10891023).

Almost surely, 2^43426781 is an apocalyptic number.

It is an amenable number.

43426781 is a deficient number, since it is larger than the sum of its proper divisors (137311).

43426781 is a wasteful number, since it uses less digits than its factorization.

43426781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137310.

The product of its digits is 32256, while the sum is 35.

The square root of 43426781 is about 6589.8999233676. The cubic root of 43426781 is about 351.4950495955.

The spelling of 43426781 in words is "forty-three million, four hundred twenty-six thousand, seven hundred eighty-one".