43390081 has 16 divisors (see below), whose sum is σ = 50526720. Its totient is φ = 36495360.

The previous prime is 43390073. The next prime is 43390097. The reversal of 43390081 is 18009334.

It is a cyclic number.

It is not a de Polignac number, because 43390081 - 2³ = 43390073 is a prime.

It is a super-2 number, since 2×43390081² = 3765398258373122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43390021) 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, 159976 + ... + 160246.

It is an arithmetic number, because the mean of its divisors is an integer number (3157920).

Almost surely, 2^43390081 is an apocalyptic number.

It is an amenable number.

43390081 is a deficient number, since it is larger than the sum of its proper divisors (7136639).

43390081 is a wasteful number, since it uses less digits than its factorization.

43390081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 43390081 is about 6587.1147705198. The cubic root of 43390081 is about 351.3960054602.

The spelling of 43390081 in words is "forty-three million, three hundred ninety thousand, eighty-one".