43985389 has 12 divisors (see below), whose sum is σ = 52135164. Its totient is φ = 36988224.

The previous prime is 43985377. The next prime is 43985419. The reversal of 43985389 is 98358934.

It can be written as a sum of positive squares in 2 ways, for example, as 23600164 + 20385225 = 4858^2 + 4515^2 .

It is not a de Polignac number, because 43985389 - 2²⁵ = 10430957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43985369) 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, 5872 + ... + 11065.

It is an arithmetic number, because the mean of its divisors is an integer number (4344597).

Almost surely, 2^43985389 is an apocalyptic number.

43985389 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

43985389 is a deficient number, since it is larger than the sum of its proper divisors (8149775).

43985389 is a wasteful number, since it uses less digits than its factorization.

43985389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17004 (or 16997 counting only the distinct ones).

The product of its digits is 933120, while the sum is 49.

The square root of 43985389 is about 6632.1481437013. The cubic root of 43985389 is about 352.9957519946.

The spelling of 43985389 in words is "forty-three million, nine hundred eighty-five thousand, three hundred eighty-nine".