43351989 has 16 divisors (see below), whose sum is σ = 61896960. Its totient is φ = 26892800.

The previous prime is 43351937. The next prime is 43352021. The reversal of 43351989 is 98915334.

It is a cyclic number.

It is not a de Polignac number, because 43351989 - 2¹¹ = 43349941 is a prime.

It is a super-2 number, since 2×43351989² = 3758789900512242, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 43351989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43351909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237 + ... + 9314.

It is an arithmetic number, because the mean of its divisors is an integer number (3868560).

Almost surely, 2^43351989 is an apocalyptic number.

It is an amenable number.

43351989 is a deficient number, since it is larger than the sum of its proper divisors (18544971).

43351989 is a wasteful number, since it uses less digits than its factorization.

43351989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9660.

The product of its digits is 116640, while the sum is 42.

The square root of 43351989 is about 6584.2227331706. Note that the first 3 decimals coincide. The cubic root of 43351989 is about 351.2931455804.

The spelling of 43351989 in words is "forty-three million, three hundred fifty-one thousand, nine hundred eighty-nine".