43538813 has 4 divisors (see below), whose sum is σ = 43582560. Its totient is φ = 43495068.

The previous prime is 43538801. The next prime is 43538837. The reversal of 43538813 is 31883534.

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 43538813 - 2⁶ = 43538749 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 (43538863) 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, 20345 + ... + 22382.

It is an arithmetic number, because the mean of its divisors is an integer number (10895640).

Almost surely, 2^43538813 is an apocalyptic number.

It is an amenable number.

43538813 is a deficient number, since it is larger than the sum of its proper divisors (43747).

43538813 is a wasteful number, since it uses less digits than its factorization.

43538813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43746.

The product of its digits is 34560, while the sum is 35.

The square root of 43538813 is about 6598.3947290231. The cubic root of 43538813 is about 351.7970512483.

The spelling of 43538813 in words is "forty-three million, five hundred thirty-eight thousand, eight hundred thirteen".