43739389 has 4 divisors (see below), whose sum is σ = 43811356. Its totient is φ = 43667424.

The previous prime is 43739383. The next prime is 43739393. The reversal of 43739389 is 98393734.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21808900 + 21930489 = 4670^2 + 4683^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43739389 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 (43739383) 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, 35064 + ... + 36289.

It is an arithmetic number, because the mean of its divisors is an integer number (10952839).

Almost surely, 2^43739389 is an apocalyptic number.

It is an amenable number.

43739389 is a deficient number, since it is larger than the sum of its proper divisors (71967).

43739389 is an equidigital number, since it uses as much as digits as its factorization.

43739389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71966.

The product of its digits is 489888, while the sum is 46.

The square root of 43739389 is about 6613.5761128152. The cubic root of 43739389 is about 352.3364471049.

The spelling of 43739389 in words is "forty-three million, seven hundred thirty-nine thousand, three hundred eighty-nine".