43969969 has 2 divisors, whose sum is σ = 43969970. Its totient is φ = 43969968.

The previous prime is 43969967. The next prime is 43970011. The reversal of 43969969 is 96996934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39538944 + 4431025 = 6288^2 + 2105^2 .

It is a cyclic number.

It is not a de Polignac number, because 43969969 - 2¹ = 43969967 is a prime.

It is a super-2 number, since 2×43969969² = 3866716347721922, which contains 22 as substring.

Together with 43969967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43969963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21984984 + 21984985.

It is an arithmetic number, because the mean of its divisors is an integer number (21984985).

Almost surely, 2^43969969 is an apocalyptic number.

It is an amenable number.

43969969 is a deficient number, since it is larger than the sum of its proper divisors (1).

43969969 is an equidigital number, since it uses as much as digits as its factorization.

43969969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 55.

The square root of 43969969 is about 6630.9855225298. The cubic root of 43969969 is about 352.9544971536.

It can be divided in two parts, 4396 and 9969, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 43969969 in words is "forty-three million, nine hundred sixty-nine thousand, nine hundred sixty-nine".