8404781 has 12 divisors (see below), whose sum is σ = 10559136. Its totient is φ = 6548520.

The previous prime is 8404777. The next prime is 8404787. The reversal of 8404781 is 1874048.

It is not a de Polignac number, because 8404781 - 2² = 8404777 is a prime.

It is a super-3 number, since 3×8404781³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8404787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4115 + ... + 5808.

It is an arithmetic number, because the mean of its divisors is an integer number (879928).

Almost surely, 2^8404781 is an apocalyptic number.

It is an amenable number.

8404781 is a deficient number, since it is larger than the sum of its proper divisors (2154355).

8404781 is a wasteful number, since it uses less digits than its factorization.

8404781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9952 (or 9941 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 8404781 is about 2899.1000327688. The cubic root of 8404781 is about 203.3178306434.

The spelling of 8404781 in words is "eight million, four hundred four thousand, seven hundred eighty-one".