8406404 has 12 divisors (see below), whose sum is σ = 15218700. Its totient is φ = 4058208.

The previous prime is 8406367. The next prime is 8406439. The reversal of 8406404 is 4046048.

It can be written as a sum of positive squares in 2 ways, for example, as 2256004 + 6150400 = 1502^2 + 2480^2 .

It is a super-2 number, since 2×8406404² = 141335256422432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36119 + ... + 36350.

It is an arithmetic number, because the mean of its divisors is an integer number (1268225).

Almost surely, 2^8406404 is an apocalyptic number.

It is an amenable number.

8406404 is a deficient number, since it is larger than the sum of its proper divisors (6812296).

8406404 is a wasteful number, since it uses less digits than its factorization.

8406404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72502 (or 72500 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 8406404 is about 2899.3799337100. The cubic root of 8406404 is about 203.3309169888.

The spelling of 8406404 in words is "eight million, four hundred six thousand, four hundred four".