43845989 has 4 divisors (see below), whose sum is σ = 47832000. Its totient is φ = 39859980.

The previous prime is 43845973. The next prime is 43846001. The reversal of 43845989 is 98954834.

43845989 = 3822² + 3823² + 3824².

It is a happy number.

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 not a de Polignac number, because 43845989 - 2⁴ = 43845973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43845959) 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, 1992989 + ... + 1993010.

It is an arithmetic number, because the mean of its divisors is an integer number (11958000).

Almost surely, 2^43845989 is an apocalyptic number.

It is an amenable number.

43845989 is a deficient number, since it is larger than the sum of its proper divisors (3986011).

43845989 is a wasteful number, since it uses less digits than its factorization.

43845989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986010.

The product of its digits is 1244160, while the sum is 50.

The square root of 43845989 is about 6621.6303883560. The cubic root of 43845989 is about 352.6224486156.

The spelling of 43845989 in words is "forty-three million, eight hundred forty-five thousand, nine hundred eighty-nine".