43940691 has 16 divisors (see below), whose sum is σ = 65224320. Its totient is φ = 29236680.

The previous prime is 43940681. The next prime is 43940717. The reversal of 43940691 is 19604934.

It is not a de Polignac number, because 43940691 - 2⁶ = 43940627 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43940641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16096 + ... + 18626.

It is an arithmetic number, because the mean of its divisors is an integer number (4076520).

Almost surely, 2^43940691 is an apocalyptic number.

43940691 is a deficient number, since it is larger than the sum of its proper divisors (21283629).

43940691 is a wasteful number, since it uses less digits than its factorization.

43940691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183 (or 3177 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 43940691 is about 6628.7774891001. Note that the first 3 decimals coincide. The cubic root of 43940691 is about 352.8761399135.

The spelling of 43940691 in words is "forty-three million, nine hundred forty thousand, six hundred ninety-one".