1999868415 has 8 divisors (see below), whose sum is σ = 3199789488. Its totient is φ = 1066596480.

The previous prime is 1999868407. The next prime is 1999868417. The reversal of 1999868415 is 5148689991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1999868415 - 2³ = 1999868407 is a prime.

It is a super-2 number, since 2×1999868415² = 7998947354629224450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999868417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66662266 + ... + 66662295.

It is an arithmetic number, because the mean of its divisors is an integer number (399973686).

Almost surely, 2^1999868415 is an apocalyptic number.

1999868415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1999868415 is a deficient number, since it is larger than the sum of its proper divisors (1199921073).

1999868415 is a wasteful number, since it uses less digits than its factorization.

1999868415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133324569.

The product of its digits is 5598720, while the sum is 60.

The square root of 1999868415 is about 44719.8883607730. Note that the first 3 decimals coincide. The cubic root of 1999868415 is about 1259.8934181703.

The spelling of 1999868415 in words is "one billion, nine hundred ninety-nine million, eight hundred sixty-eight thousand, four hundred fifteen".