43949623 has 2 divisors, whose sum is σ = 43949624. Its totient is φ = 43949622.

The previous prime is 43949621. The next prime is 43949627. The reversal of 43949623 is 32694934.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43949623 - 2¹ = 43949621 is a prime.

Together with 43949621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43949621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21974811 + 21974812.

It is an arithmetic number, because the mean of its divisors is an integer number (21974812).

Almost surely, 2^43949623 is an apocalyptic number.

43949623 is a deficient number, since it is larger than the sum of its proper divisors (1).

43949623 is an equidigital number, since it uses as much as digits as its factorization.

43949623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 40.

The square root of 43949623 is about 6629.4511839216. The cubic root of 43949623 is about 352.9000484750.

The spelling of 43949623 in words is "forty-three million, nine hundred forty-nine thousand, six hundred twenty-three".