43779989 has 4 divisors (see below), whose sum is σ = 47760000. Its totient is φ = 39799980.

The previous prime is 43779979. The next prime is 43779997. The reversal of 43779989 is 98997734.

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 de Polignac number, because none of the positive numbers 2^k-43779989 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 (43779979) 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, 1989989 + ... + 1990010.

It is an arithmetic number, because the mean of its divisors is an integer number (11940000).

Almost surely, 2^43779989 is an apocalyptic number.

It is an amenable number.

43779989 is a deficient number, since it is larger than the sum of its proper divisors (3980011).

43779989 is a wasteful number, since it uses less digits than its factorization.

43779989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3980010.

The product of its digits is 3429216, while the sum is 56.

The square root of 43779989 is about 6616.6448446324. The cubic root of 43779989 is about 352.4454292399.

The spelling of 43779989 in words is "forty-three million, seven hundred seventy-nine thousand, nine hundred eighty-nine".