43961813 has 24 divisors (see below), whose sum is σ = 55171584. Its totient is φ = 34272000.

The previous prime is 43961807. The next prime is 43961833. The reversal of 43961813 is 31816934.

It is not a de Polignac number, because 43961813 - 2⁸ = 43961557 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43961833) 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, 62363 + ... + 63063.

It is an arithmetic number, because the mean of its divisors is an integer number (2298816).

Almost surely, 2^43961813 is an apocalyptic number.

It is an amenable number.

43961813 is a deficient number, since it is larger than the sum of its proper divisors (11209771).

43961813 is a wasteful number, since it uses less digits than its factorization.

43961813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 756 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 43961813 is about 6630.3705024682. The cubic root of 43961813 is about 352.9326725996.

The spelling of 43961813 in words is "forty-three million, nine hundred sixty-one thousand, eight hundred thirteen".