999987829 has 2 divisors, whose sum is σ = 999987830. Its totient is φ = 999987828.

The previous prime is 999987763. The next prime is 999987847. The reversal of 999987829 is 928789999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 828115729 + 171872100 = 28777^2 + 13110^2 .

It is a cyclic number.

It is not a de Polignac number, because 999987829 - 2¹³ = 999979637 is a prime.

It is a super-3 number, since 3×999987829³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999987929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499993914 + 499993915.

It is an arithmetic number, because the mean of its divisors is an integer number (499993915).

Almost surely, 2^999987829 is an apocalyptic number.

It is an amenable number.

999987829 is a deficient number, since it is larger than the sum of its proper divisors (1).

999987829 is an equidigital number, since it uses as much as digits as its factorization.

999987829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52907904, while the sum is 70.

The square root of 999987829 is about 31622.5841606912. The cubic root of 999987829 is about 999.9959429835.

The spelling of 999987829 in words is "nine hundred ninety-nine million, nine hundred eighty-seven thousand, eight hundred twenty-nine".