43469981 has 4 divisors (see below), whose sum is σ = 43736832. Its totient is φ = 43203132.

The previous prime is 43469957. The next prime is 43469983. The reversal of 43469981 is 18996434.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18996434 = 2 ⋅9498217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43469981 is a prime.

It is a super-2 number, since 2×43469981² = 3779278496280722, 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 (43469983) 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, 133181 + ... + 133506.

It is an arithmetic number, because the mean of its divisors is an integer number (10934208).

Almost surely, 2^43469981 is an apocalyptic number.

It is an amenable number.

43469981 is a deficient number, since it is larger than the sum of its proper divisors (266851).

43469981 is a wasteful number, since it uses less digits than its factorization.

43469981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266850.

The product of its digits is 186624, while the sum is 44.

The square root of 43469981 is about 6593.1768518674. The cubic root of 43469981 is about 351.6115641324.

The spelling of 43469981 in words is "forty-three million, four hundred sixty-nine thousand, nine hundred eighty-one".