90443917 has 4 divisors (see below), whose sum is σ = 92150460. Its totient is φ = 88737376.

The previous prime is 90443897. The next prime is 90443963. The reversal of 90443917 is 71934409.

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 57851236 + 32592681 = 7606^2 + 5709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90443917 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 (90443117) 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, 853192 + ... + 853297.

It is an arithmetic number, because the mean of its divisors is an integer number (23037615).

Almost surely, 2^90443917 is an apocalyptic number.

It is an amenable number.

90443917 is a deficient number, since it is larger than the sum of its proper divisors (1706543).

90443917 is a wasteful number, since it uses less digits than its factorization.

90443917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706542.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 90443917 is about 9510.2006813737. The cubic root of 90443917 is about 448.8760709092.

The spelling of 90443917 in words is "ninety million, four hundred forty-three thousand, nine hundred seventeen".