43329981 has 4 divisors (see below), whose sum is σ = 57773312. Its totient is φ = 28886652.

The previous prime is 43329977. The next prime is 43330003. The reversal of 43329981 is 18992334.

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 not a de Polignac number, because 43329981 - 2² = 43329977 is a prime.

It is a super-2 number, since 2×43329981² = 3754974506920722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43329941) 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, 7221661 + ... + 7221666.

It is an arithmetic number, because the mean of its divisors is an integer number (14443328).

Almost surely, 2^43329981 is an apocalyptic number.

It is an amenable number.

43329981 is a deficient number, since it is larger than the sum of its proper divisors (14443331).

43329981 is a wasteful number, since it uses less digits than its factorization.

43329981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14443330.

The product of its digits is 46656, while the sum is 39.

The square root of 43329981 is about 6582.5512531237. The cubic root of 43329981 is about 351.2336898832.

The spelling of 43329981 in words is "forty-three million, three hundred twenty-nine thousand, nine hundred eighty-one".