43406981 has 8 divisors (see below), whose sum is σ = 44176704. Its totient is φ = 42644160.

The previous prime is 43406977. The next prime is 43406999. The reversal of 43406981 is 18960434.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43406981 - 2² = 43406977 is a prime.

It is a super-2 number, since 2×43406981² = 3768331999068722, 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 (43406081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11885 + ... + 15101.

It is an arithmetic number, because the mean of its divisors is an integer number (5522088).

Almost surely, 2^43406981 is an apocalyptic number.

It is an amenable number.

43406981 is a deficient number, since it is larger than the sum of its proper divisors (769723).

43406981 is a wasteful number, since it uses less digits than its factorization.

43406981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3451.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 43406981 is about 6588.3974530989. The cubic root of 43406981 is about 351.4416212746.

The spelling of 43406981 in words is "forty-three million, four hundred six thousand, nine hundred eighty-one".