43378109 has 4 divisors (see below), whose sum is σ = 43825404. Its totient is φ = 42930816.

The previous prime is 43378103. The next prime is 43378129. The reversal of 43378109 is 90187334.

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 6775609 + 36602500 = 2603^2 + 6050^2 .

It is a cyclic number.

It is not a de Polignac number, because 43378109 - 2⁸ = 43377853 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 (43378103) 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, 223502 + ... + 223695.

It is an arithmetic number, because the mean of its divisors is an integer number (10956351).

Almost surely, 2^43378109 is an apocalyptic number.

It is an amenable number.

43378109 is a deficient number, since it is larger than the sum of its proper divisors (447295).

43378109 is an equidigital number, since it uses as much as digits as its factorization.

43378109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447294.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 43378109 is about 6586.2059639826. The cubic root of 43378109 is about 351.3636839414.

The spelling of 43378109 in words is "forty-three million, three hundred seventy-eight thousand, one hundred nine".