90238821 has 8 divisors (see below), whose sum is σ = 125549760. Its totient is φ = 57543552.

The previous prime is 90238793. The next prime is 90238849. The reversal of 90238821 is 12883209.

It is an interprime number because it is at equal distance from previous prime (90238793) and next prime (90238849).

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

It is not a de Polignac number, because 90238821 - 2⁷ = 90238693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90238871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653836 + ... + 653973.

It is an arithmetic number, because the mean of its divisors is an integer number (15693720).

Almost surely, 2^90238821 is an apocalyptic number.

It is an amenable number.

90238821 is a deficient number, since it is larger than the sum of its proper divisors (35310939).

90238821 is a wasteful number, since it uses less digits than its factorization.

90238821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307835.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 90238821 is about 9499.4116133580. The cubic root of 90238821 is about 448.5365147642.

The spelling of 90238821 in words is "ninety million, two hundred thirty-eight thousand, eight hundred twenty-one".