43709881 has 2 divisors, whose sum is σ = 43709882. Its totient is φ = 43709880.

The previous prime is 43709879. The next prime is 43709903. The reversal of 43709881 is 18890734.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39942400 + 3767481 = 6320^2 + 1941^2 .

It is a cyclic number.

It is not a de Polignac number, because 43709881 - 2¹ = 43709879 is a prime.

It is a super-2 number, since 2×43709881² = 3821107394068322, which contains 22 as substring.

Together with 43709879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43709581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21854940 + 21854941.

It is an arithmetic number, because the mean of its divisors is an integer number (21854941).

Almost surely, 2^43709881 is an apocalyptic number.

It is an amenable number.

43709881 is a deficient number, since it is larger than the sum of its proper divisors (1).

43709881 is an equidigital number, since it uses as much as digits as its factorization.

43709881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 43709881 is about 6611.3448707506. The cubic root of 43709881 is about 352.2571967771.

The spelling of 43709881 in words is "forty-three million, seven hundred nine thousand, eight hundred eighty-one".