999994815 has 48 divisors (see below), whose sum is σ = 1801581600. Its totient is φ = 532858176.

The previous prime is 999994813. The next prime is 999994823. The reversal of 999994815 is 518499999.

It is not a de Polignac number, because 999994815 - 2¹ = 999994813 is a prime.

It is a super-3 number, since 3×999994815³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999994813) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 885171 + ... + 886299.

It is an arithmetic number, because the mean of its divisors is an integer number (37532950).

Almost surely, 2^999994815 is an apocalyptic number.

999994815 is a deficient number, since it is larger than the sum of its proper divisors (801586785).

999994815 is an frugal number, since it uses more digits than its factorization.

999994815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167 (or 1137 counting only the distinct ones).

The product of its digits is 9447840, while the sum is 63.

The square root of 999994815 is about 31622.6946195292. The cubic root of 999994815 is about 999.9982716637.

The spelling of 999994815 in words is "nine hundred ninety-nine million, nine hundred ninety-four thousand, eight hundred fifteen".