43940731 has 2 divisors, whose sum is σ = 43940732. Its totient is φ = 43940730.

The previous prime is 43940717. The next prime is 43940747. The reversal of 43940731 is 13704934.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43940731 is a prime.

It is a super-2 number, since 2×43940731² = 3861575681628722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43940693 and 43940702.

It is not a weakly prime, because it can be changed into another prime (43940761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21970365 + 21970366.

It is an arithmetic number, because the mean of its divisors is an integer number (21970366).

Almost surely, 2^43940731 is an apocalyptic number.

43940731 is a deficient number, since it is larger than the sum of its proper divisors (1).

43940731 is an equidigital number, since it uses as much as digits as its factorization.

43940731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 43940731 is about 6628.7805062470. The cubic root of 43940731 is about 352.8762469900.

The spelling of 43940731 in words is "forty-three million, nine hundred forty thousand, seven hundred thirty-one".