43629681 has 16 divisors (see below), whose sum is σ = 61712640. Its totient is φ = 27340560.

The previous prime is 43629671. The next prime is 43629709. The reversal of 43629681 is 18692634.

It is a de Polignac number, because none of the positive numbers 2^k-43629681 is a prime.

It is a super-2 number, since 2×43629681² = 3807098128323522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43629631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4546 + ... + 10388.

It is an arithmetic number, because the mean of its divisors is an integer number (3857040).

Almost surely, 2^43629681 is an apocalyptic number.

It is an amenable number.

43629681 is a deficient number, since it is larger than the sum of its proper divisors (18082959).

43629681 is a wasteful number, since it uses less digits than its factorization.

43629681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5996.

The product of its digits is 62208, while the sum is 39.

The square root of 43629681 is about 6605.2767542322. The cubic root of 43629681 is about 352.0416213912.

The spelling of 43629681 in words is "forty-three million, six hundred twenty-nine thousand, six hundred eighty-one".