999822019 has 10 divisors (see below), whose sum is σ = 1166392420. Its totient is φ = 856988244.

The previous prime is 999822007. The next prime is 999822041. The reversal of 999822019 is 910228999.

It is a happy number.

It is not a de Polignac number, because 999822019 - 2¹³ = 999813827 is a prime.

It is a super-2 number, since 2×999822019² = 1999288139354472722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999822059) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 205809 + ... + 210610.

It is an arithmetic number, because the mean of its divisors is an integer number (116639242).

Almost surely, 2^999822019 is an apocalyptic number.

999822019 is a deficient number, since it is larger than the sum of its proper divisors (166570401).

999822019 is an frugal number, since it uses more digits than its factorization.

999822019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416447 (or 416426 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 999822019 is about 31619.9623497562. The cubic root of 999822019 is about 999.9406694800.

The spelling of 999822019 in words is "nine hundred ninety-nine million, eight hundred twenty-two thousand, nineteen".