43407989 has 4 divisors (see below), whose sum is σ = 45692640. Its totient is φ = 41123340.

The previous prime is 43407979. The next prime is 43408003. The reversal of 43407989 is 98970434.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43407989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43407979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142297 + ... + 1142334.

It is an arithmetic number, because the mean of its divisors is an integer number (11423160).

Almost surely, 2^43407989 is an apocalyptic number.

It is an amenable number.

43407989 is a deficient number, since it is larger than the sum of its proper divisors (2284651).

43407989 is a wasteful number, since it uses less digits than its factorization.

43407989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284650.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 43407989 is about 6588.4739507719. The cubic root of 43407989 is about 351.4443416543. Note that the first 3 decimals are identical.

The spelling of 43407989 in words is "forty-three million, four hundred seven thousand, nine hundred eighty-nine".