999756516 has 48 divisors (see below), whose sum is σ = 2678780160. Its totient is φ = 287010720.

The previous prime is 999756509. The next prime is 999756517. The reversal of 999756516 is 615657999.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (999756517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196806 + ... + 201821.

It is an arithmetic number, because the mean of its divisors is an integer number (55807920).

Almost surely, 2^999756516 is an apocalyptic number.

It is an amenable number.

999756516 is an abundant number, since it is smaller than the sum of its proper divisors (1679023644).

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

999756516 is a wasteful number, since it uses less digits than its factorization.

999756516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398664 (or 398662 counting only the distinct ones).

The product of its digits is 4592700, while the sum is 57.

The square root of 999756516 is about 31618.9265472438. The cubic root of 999756516 is about 999.9188320786.

It can be divided in two parts, 99975 and 6516, that added together give a triangular number (106491 = T₄₆₁).

The spelling of 999756516 in words is "nine hundred ninety-nine million, seven hundred fifty-six thousand, five hundred sixteen".