43394013 has 24 divisors (see below), whose sum is σ = 71475768. Its totient is φ = 25132032.

The previous prime is 43394011. The next prime is 43394027. The reversal of 43394013 is 31049334.

It can be written as a sum of positive squares in 4 ways, for example, as 7717284 + 35676729 = 2778^2 + 5973^2 .

It is not a de Polignac number, because 43394013 - 2¹ = 43394011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43394011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8920 + ... + 12897.

It is an arithmetic number, because the mean of its divisors is an integer number (2978157).

Almost surely, 2^43394013 is an apocalyptic number.

It is an amenable number.

43394013 is a deficient number, since it is larger than the sum of its proper divisors (28081755).

43394013 is a wasteful number, since it uses less digits than its factorization.

43394013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21853 (or 21850 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 43394013 is about 6587.4132252349. The cubic root of 43394013 is about 351.4066196169.

The spelling of 43394013 in words is "forty-three million, three hundred ninety-four thousand, thirteen".