999999987826 has 32 divisors (see below), whose sum is σ = 1782904112640. Its totient is φ = 411710060736.

The previous prime is 999999987787. The next prime is 999999987827. The reversal of 999999987826 is 628789999999.

It is a happy number.

It is a super-3 number, since 3×999999987826³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (999999987827) 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, 12177445 + ... + 12259288.

It is an arithmetic number, because the mean of its divisors is an integer number (55715753520).

Almost surely, 2^999999987826 is an apocalyptic number.

999999987826 is a deficient number, since it is larger than the sum of its proper divisors (782904124814).

999999987826 is a wasteful number, since it uses less digits than its factorization.

999999987826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24436858.

The product of its digits is 25713241344, while the sum is 94.

The spelling of 999999987826 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred eighty-seven thousand, eight hundred twenty-six".