43948781 has 2 divisors, whose sum is σ = 43948782. Its totient is φ = 43948780.

The previous prime is 43948777. The next prime is 43948811. The reversal of 43948781 is 18784934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38019556 + 5929225 = 6166^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 43948781 - 2² = 43948777 is a prime.

It is a super-2 number, since 2×43948781² = 3862990702771922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43948721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21974390 + 21974391.

It is an arithmetic number, because the mean of its divisors is an integer number (21974391).

Almost surely, 2^43948781 is an apocalyptic number.

It is an amenable number.

43948781 is a deficient number, since it is larger than the sum of its proper divisors (1).

43948781 is an equidigital number, since it uses as much as digits as its factorization.

43948781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 43948781 is about 6629.3876791149. The cubic root of 43948781 is about 352.8977948058.

The spelling of 43948781 in words is "forty-three million, nine hundred forty-eight thousand, seven hundred eighty-one".