43690993 has 2 divisors, whose sum is σ = 43690994. Its totient is φ = 43690992.

The previous prime is 43690991. The next prime is 43691113. The reversal of 43690993 is 39909634.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43125489 + 565504 = 6567^2 + 752^2 .

It is a cyclic number.

It is not a de Polignac number, because 43690993 - 2¹ = 43690991 is a prime.

Together with 43690991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43690991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21845496 + 21845497.

It is an arithmetic number, because the mean of its divisors is an integer number (21845497).

Almost surely, 2^43690993 is an apocalyptic number.

It is an amenable number.

43690993 is a deficient number, since it is larger than the sum of its proper divisors (1).

43690993 is an equidigital number, since it uses as much as digits as its factorization.

43690993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 43.

The square root of 43690993 is about 6609.9162627071. The cubic root of 43690993 is about 352.2064501085.

The spelling of 43690993 in words is "forty-three million, six hundred ninety thousand, nine hundred ninety-three".