9078921 has 12 divisors (see below), whose sum is σ = 13169520. Its totient is φ = 6027000.

The previous prime is 9078919. The next prime is 9078929. The reversal of 9078921 is 1298709.

It is a happy number.

It is not a de Polignac number, because 9078921 - 2¹ = 9078919 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (9078929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250 + ... + 4268.

It is an arithmetic number, because the mean of its divisors is an integer number (1097460).

Almost surely, 2^9078921 is an apocalyptic number.

It is an amenable number.

9078921 is a deficient number, since it is larger than the sum of its proper divisors (4090599).

9078921 is a wasteful number, since it uses less digits than its factorization.

9078921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4276 (or 4273 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 9078921 is about 3013.1247899813. The cubic root of 9078921 is about 208.6146222055.

It can be divided in two parts, 9078 and 921, that added together give a palindrome (9999).

The spelling of 9078921 in words is "nine million, seventy-eight thousand, nine hundred twenty-one".