999022639 has 2 divisors, whose sum is σ = 999022640.
Its totient is φ = 999022638.
The previous prime is 999022627. The next prime is 999022667. The reversal of 999022639 is 936220999.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 999022639 - 219 = 998498351 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 999022592 and 999022601.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (999022939) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499511319 + 499511320.
It is an arithmetic number, because the mean of its divisors is an integer number (499511320).
Almost surely, 2999022639 is an apocalyptic number.
999022639 is a deficient number, since it is larger than the sum of its proper divisors (1).
999022639 is an equidigital number, since it uses as much as digits as its factorization.
999022639 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 472392, while the sum is 49.
The square root of 999022639 is about 31607.3193896604.
The cubic root of 999022639 is about 999.6741068052.
The spelling of 999022639 in words is "nine hundred ninety-nine million, twenty-two thousand, six hundred thirty-nine".