1000009191920 has 20 divisors (see below), whose sum is σ = 2325021371400. Its totient is φ = 400003676736.

The previous prime is 1000009191859. The next prime is 1000009191947. The reversal of 1000009191920 is 291919000001.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×1000009191920³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6250057370 + ... + 6250057529.

It is an arithmetic number, because the mean of its divisors is an integer number (116251068570).

Almost surely, 2^{1000009191920} is an apocalyptic number.

1000009191920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000009191920 is an abundant number, since it is smaller than the sum of its proper divisors (1325012179480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1000009191920 is a wasteful number, since it uses less digits than its factorization.

1000009191920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12500114912 (or 12500114906 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 32.

The spelling of 1000009191920 in words is "one trillion, nine million, one hundred ninety-one thousand, nine hundred twenty".