90443239 has 2 divisors, whose sum is σ = 90443240. Its totient is φ = 90443238.

The previous prime is 90443237. The next prime is 90443267. The reversal of 90443239 is 93234409.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90443239 - 2¹ = 90443237 is a prime.

It is a super-2 number, since 2×90443239² = 16359958961622242, which contains 22 as substring.

Together with 90443237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90443231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45221619 + 45221620.

It is an arithmetic number, because the mean of its divisors is an integer number (45221620).

Almost surely, 2^90443239 is an apocalyptic number.

90443239 is a deficient number, since it is larger than the sum of its proper divisors (1).

90443239 is an equidigital number, since it uses as much as digits as its factorization.

90443239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 90443239 is about 9510.1650353714. The cubic root of 90443239 is about 448.8749492611.

The spelling of 90443239 in words is "ninety million, four hundred forty-three thousand, two hundred thirty-nine".