90869 has 4 divisors (see below), whose sum is σ = 91980. Its totient is φ = 89760.

The previous prime is 90863. The next prime is 90887. The reversal of 90869 is 96809.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96809 = 131 ⋅739.

It can be written as a sum of positive squares in 2 ways, for example, as 34225 + 56644 = 185^2 + 238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90869 is a prime.

It is a super-2 number, since 2×90869² = 16514350322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90863) 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, 422 + ... + 599.

It is an arithmetic number, because the mean of its divisors is an integer number (22995).

2⁹⁰⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

90869 is a deficient number, since it is larger than the sum of its proper divisors (1111).

90869 is a wasteful number, since it uses less digits than its factorization.

90869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 90869 is about 301.4448539949. Note that the first 3 decimals coincide. The cubic root of 90869 is about 44.9578205590.

It can be divided in two parts, 90 and 869, that multiplied together give a triangular number (78210 = T₃₉₅).

The spelling of 90869 in words is "ninety thousand, eight hundred sixty-nine".