43949887 has 2 divisors, whose sum is σ = 43949888. Its totient is φ = 43949886.

The previous prime is 43949863. The next prime is 43949897. The reversal of 43949887 is 78894934.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43949887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43949897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21974943 + 21974944.

It is an arithmetic number, because the mean of its divisors is an integer number (21974944).

Almost surely, 2^43949887 is an apocalyptic number.

43949887 is a deficient number, since it is larger than the sum of its proper divisors (1).

43949887 is an equidigital number, since it uses as much as digits as its factorization.

43949887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 52.

The square root of 43949887 is about 6629.4710950422. The cubic root of 43949887 is about 352.9007550827.

The spelling of 43949887 in words is "forty-three million, nine hundred forty-nine thousand, eight hundred eighty-seven".