90209923 has 8 divisors (see below), whose sum is σ = 93534480. Its totient is φ = 86899680.

The previous prime is 90209909. The next prime is 90209927. The reversal of 90209923 is 32990209.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90209923 - 2²¹ = 88112771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90209927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10213 + ... + 16873.

It is an arithmetic number, because the mean of its divisors is an integer number (11691810).

Almost surely, 2^90209923 is an apocalyptic number.

90209923 is a deficient number, since it is larger than the sum of its proper divisors (3324557).

90209923 is a wasteful number, since it uses less digits than its factorization.

90209923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7157.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 90209923 is about 9497.8904499894. The cubic root of 90209923 is about 448.4886300071.

The spelling of 90209923 in words is "ninety million, two hundred nine thousand, nine hundred twenty-three".