908921 has 8 divisors (see below), whose sum is σ = 987840. Its totient is φ = 831312.

The previous prime is 908911. The next prime is 908927. The reversal of 908921 is 129809.

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 908921 - 2⁶ = 908857 is a prime.

It is a super-2 number, since 2×908921² = 1652274768482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 908921.

It is not an unprimeable number, because it can be changed into a prime (908927) 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, 1556 + ... + 2058.

It is an arithmetic number, because the mean of its divisors is an integer number (123480).

2⁹⁰⁸⁹²¹ is an apocalyptic number.

It is an amenable number.

908921 is a deficient number, since it is larger than the sum of its proper divisors (78919).

908921 is a wasteful number, since it uses less digits than its factorization.

908921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 908921 is about 953.3734840030. The cubic root of 908921 is about 96.8668950555.

The spelling of 908921 in words is "nine hundred eight thousand, nine hundred twenty-one".