43009813 has 48 divisors (see below), whose sum is σ = 59754240. Its totient is φ = 30159360.

The previous prime is 43009807. The next prime is 43009823. The reversal of 43009813 is 31890034.

It is not a de Polignac number, because 43009813 - 2⁹ = 43009301 is a prime.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43009823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 417520 + ... + 417622.

It is an arithmetic number, because the mean of its divisors is an integer number (1244880).

Almost surely, 2^43009813 is an apocalyptic number.

It is an amenable number.

43009813 is a deficient number, since it is larger than the sum of its proper divisors (16744427).

43009813 is a wasteful number, since it uses less digits than its factorization.

43009813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 43009813 is about 6558.1867158537. The cubic root of 43009813 is about 350.3664542792.

Adding to 43009813 its reverse (31890034), we get a palindrome (74899847).

The spelling of 43009813 in words is "forty-three million, nine thousand, eight hundred thirteen".