8686404 has 36 divisors (see below), whose sum is σ = 22183980. Its totient is φ = 2865600.

The previous prime is 8686397. The next prime is 8686409. The reversal of 8686404 is 4046868.

8686404 is a `hidden beast` number, since 8 + 6 + 8 + 640 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5616900 + 3069504 = 2370^2 + 1752^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×8686404² = 150907228902432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8686409) 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, 2442 + ... + 4830.

Almost surely, 2^8686404 is an apocalyptic number.

It is an amenable number.

8686404 is an abundant number, since it is smaller than the sum of its proper divisors (13497576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8686404 is a wasteful number, since it uses less digits than its factorization.

8686404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500 (or 2495 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 8686404 is about 2947.2706017602. The cubic root of 8686404 is about 205.5638177130.

The spelling of 8686404 in words is "eight million, six hundred eighty-six thousand, four hundred four".