2154797920 has 96 divisors (see below), whose sum is σ = 5574544416. Its totient is φ = 780595200.

The previous prime is 2154797899. The next prime is 2154797959. The reversal of 2154797920 is 297974512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492382 + ... + 496738.

It is an arithmetic number, because the mean of its divisors is an integer number (58068171).

Almost surely, 2^2154797920 is an apocalyptic number.

2154797920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2154797920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2787272208).

2154797920 is an abundant number, since it is smaller than the sum of its proper divisors (3419746496).

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

2154797920 is a wasteful number, since it uses less digits than its factorization.

2154797920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4664 (or 4656 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 2154797920 is about 46419.8009474405. The cubic root of 2154797920 is about 1291.6222444845.

The spelling of 2154797920 in words is "two billion, one hundred fifty-four million, seven hundred ninety-seven thousand, nine hundred twenty".