999405486 has 64 divisors (see below), whose sum is σ = 2366323200. Its totient is φ = 311568768.

The previous prime is 999405479. The next prime is 999405487. The reversal of 999405486 is 684504999.

999405486 is a `hidden beast` number, since 9 + 9 + 94 + 0 + 548 + 6 = 666.

It is a super-2 number, since 2×999405486² = 1997622650893792392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999405487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146295 + ... + 152973.

It is an arithmetic number, because the mean of its divisors is an integer number (36973800).

Almost surely, 2^999405486 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999405486, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1183161600).

999405486 is an abundant number, since it is smaller than the sum of its proper divisors (1366917714).

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

999405486 is a wasteful number, since it uses less digits than its factorization.

999405486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6870 (or 6864 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 999405486 is about 31613.3751124425. The cubic root of 999405486 is about 999.8017893818.

The spelling of 999405486 in words is "nine hundred ninety-nine million, four hundred five thousand, four hundred eighty-six".