8404991 has 8 divisors (see below), whose sum is σ = 9642144. Its totient is φ = 7176960.

The previous prime is 8404969. The next prime is 8404993. The reversal of 8404991 is 1994048.

8404991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 8404991 - 2⁶ = 8404927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8404993) 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, 170 + ... + 4103.

It is an arithmetic number, because the mean of its divisors is an integer number (1205268).

Almost surely, 2^8404991 is an apocalyptic number.

8404991 is a deficient number, since it is larger than the sum of its proper divisors (1237153).

8404991 is a wasteful number, since it uses less digits than its factorization.

8404991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4561.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 8404991 is about 2899.1362506788. The cubic root of 8404991 is about 203.3195239808.

The spelling of 8404991 in words is "eight million, four hundred four thousand, nine hundred ninety-one".