8990921 has 4 divisors (see below), whose sum is σ = 9033744. Its totient is φ = 8948100.

The previous prime is 8990887. The next prime is 8990929. The reversal of 8990921 is 1290998.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1290998 = 2 ⋅645499.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8990921 is a prime.

It is a pancake number, because a pancake can be divided into 8990921 parts by 4240 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8990929) 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, 21095 + ... + 21516.

It is an arithmetic number, because the mean of its divisors is an integer number (2258436).

Almost surely, 2^8990921 is an apocalyptic number.

It is an amenable number.

8990921 is a deficient number, since it is larger than the sum of its proper divisors (42823).

8990921 is a wasteful number, since it uses less digits than its factorization.

8990921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42822.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 8990921 is about 2998.4864515285. The cubic root of 8990921 is about 207.9384140279.

The spelling of 8990921 in words is "eight million, nine hundred ninety thousand, nine hundred twenty-one".