43940791 has 4 divisors (see below), whose sum is σ = 43995784. Its totient is φ = 43885800.

The previous prime is 43940773. The next prime is 43940803. The reversal of 43940791 is 19704934.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19704934 = 2 ⋅9852467.

It is a cyclic number.

It is not a de Polignac number, because 43940791 - 2²¹ = 41843639 is a prime.

It is a super-2 number, since 2×43940791² = 3861586227411362, which contains 22 as substring.

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 43940791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43940731) 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, 26280 + ... + 27901.

It is an arithmetic number, because the mean of its divisors is an integer number (10998946).

Almost surely, 2^43940791 is an apocalyptic number.

43940791 is a deficient number, since it is larger than the sum of its proper divisors (54993).

43940791 is an equidigital number, since it uses as much as digits as its factorization.

43940791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54992.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 43940791 is about 6628.7850319648. The cubic root of 43940791 is about 352.8764076045.

The spelling of 43940791 in words is "forty-three million, nine hundred forty thousand, seven hundred ninety-one".