90047 has 4 divisors (see below), whose sum is σ = 91800. Its totient is φ = 88296.

The previous prime is 90031. The next prime is 90053. The reversal of 90047 is 74009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74009 = 13 ⋅5693.

It is a cyclic number.

It is not a de Polignac number, because 90047 - 2⁴ = 90031 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 (90007) 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, 797 + ... + 902.

It is an arithmetic number, because the mean of its divisors is an integer number (22950).

2⁹⁰⁰⁴⁷ is an apocalyptic number.

90047 is a deficient number, since it is larger than the sum of its proper divisors (1753).

90047 is a wasteful number, since it uses less digits than its factorization.

90047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 90047 is about 300.0783231092. The cubic root of 90047 is about 44.8218470718.

The spelling of 90047 in words is "ninety thousand, forty-seven".