90039869 has 4 divisors (see below), whose sum is σ = 90836796. Its totient is φ = 89242944.

The previous prime is 90039863. The next prime is 90039881. The reversal of 90039869 is 96893009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96893009 = 97 ⋅998897.

It can be written as a sum of positive squares in 2 ways, for example, as 12687844 + 77352025 = 3562^2 + 8795^2 .

It is a cyclic number.

It is not a de Polignac number, because 90039869 - 2¹² = 90035773 is a prime.

It is a super-2 number, since 2×90039869² = 16214356019074322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90039863) 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 3 ways as a sum of consecutive naturals, for example, 398294 + ... + 398519.

It is an arithmetic number, because the mean of its divisors is an integer number (22709199).

Almost surely, 2^90039869 is an apocalyptic number.

It is an amenable number.

90039869 is a deficient number, since it is larger than the sum of its proper divisors (796927).

90039869 is a wasteful number, since it uses less digits than its factorization.

90039869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796926.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 90039869 is about 9488.9340286462. The cubic root of 90039869 is about 448.2066386370.

The spelling of 90039869 in words is "ninety million, thirty-nine thousand, eight hundred sixty-nine".