43392989 has 4 divisors (see below), whose sum is σ = 43430556. Its totient is φ = 43355424.

The previous prime is 43392983. The next prime is 43392991. The reversal of 43392989 is 98929334.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25836889 + 17556100 = 5083^2 + 4190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43392989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43392983) 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, 16994 + ... + 19379.

It is an arithmetic number, because the mean of its divisors is an integer number (10857639).

Almost surely, 2^43392989 is an apocalyptic number.

It is an amenable number.

43392989 is a deficient number, since it is larger than the sum of its proper divisors (37567).

43392989 is a wasteful number, since it uses less digits than its factorization.

43392989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37566.

The product of its digits is 419904, while the sum is 47.

The square root of 43392989 is about 6587.3355007924. The cubic root of 43392989 is about 351.4038554629.

The spelling of 43392989 in words is "forty-three million, three hundred ninety-two thousand, nine hundred eighty-nine".