919109291920 has 40 divisors (see below), whose sum is σ = 2142567509760. Its totient is φ = 366673668480.

The previous prime is 919109291879. The next prime is 919109291927. The reversal of 919109291920 is 29192901919.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (919109291927) 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, 15126496 + ... + 15187135.

It is an arithmetic number, because the mean of its divisors is an integer number (53564187744).

Almost surely, 2^919109291920 is an apocalyptic number.

It is an amenable number.

919109291920 is an abundant number, since it is smaller than the sum of its proper divisors (1223458217840).

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

919109291920 is a wasteful number, since it uses less digits than its factorization.

919109291920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30314023 (or 30314017 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 52.

The spelling of 919109291920 in words is "nine hundred nineteen billion, one hundred nine million, two hundred ninety-one thousand, nine hundred twenty".