90219839 has 4 divisors (see below), whose sum is σ = 90343656. Its totient is φ = 90096024.

The previous prime is 90219781. The next prime is 90219851. The reversal of 90219839 is 93891209.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90219839 - 2¹⁶ = 90154303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90219796 and 90219805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90219859) 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, 60809 + ... + 62274.

It is an arithmetic number, because the mean of its divisors is an integer number (22585914).

Almost surely, 2^90219839 is an apocalyptic number.

90219839 is a deficient number, since it is larger than the sum of its proper divisors (123817).

90219839 is a wasteful number, since it uses less digits than its factorization.

90219839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123816.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 90219839 is about 9498.4124462986. The cubic root of 90219839 is about 448.5050622361.

The spelling of 90219839 in words is "ninety million, two hundred nineteen thousand, eight hundred thirty-nine".