43969989 has 12 divisors (see below), whose sum is σ = 67048224. Its totient is φ = 25108344.

The previous prime is 43969969. The next prime is 43970011. The reversal of 43969989 is 98996934.

It is not a de Polignac number, because 43969989 - 2¹⁶ = 43904453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43969909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29664 + ... + 31110.

It is an arithmetic number, because the mean of its divisors is an integer number (5587352).

Almost surely, 2^43969989 is an apocalyptic number.

It is an amenable number.

43969989 is a deficient number, since it is larger than the sum of its proper divisors (23078235).

43969989 is an frugal number, since it uses more digits than its factorization.

43969989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904 (or 1457 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 57.

The square root of 43969989 is about 6630.9870306011. The cubic root of 43969989 is about 352.9545506680.

The spelling of 43969989 in words is "forty-three million, nine hundred sixty-nine thousand, nine hundred eighty-nine".