999998919 has 16 divisors (see below), whose sum is σ = 1503594240. Its totient is φ = 656714520.

The previous prime is 999998917. The next prime is 999998921. The reversal of 999998919 is 919899999.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (999998917) and next prime (999998921).

It is not a de Polignac number, because 999998919 - 2¹ = 999998917 is a prime.

It is a super-2 number, since 2×999998919² = 1999995676002337122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999998917) 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, 274587 + ... + 278204.

It is an arithmetic number, because the mean of its divisors is an integer number (93974640).

Almost surely, 2^999998919 is an apocalyptic number.

999998919 is a deficient number, since it is larger than the sum of its proper divisors (503595321).

999998919 is a wasteful number, since it uses less digits than its factorization.

999998919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552867 (or 552861 counting only the distinct ones).

The product of its digits is 38263752, while the sum is 72.

The square root of 999998919 is about 31622.7595095684. The cubic root of 999998919 is about 999.9996396665. Note that the first 3 decimals are identical.

The spelling of 999998919 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, nine hundred nineteen".