2157844724 has 12 divisors (see below), whose sum is σ = 4315689504. Its totient is φ = 924790584.

The previous prime is 2157844691. The next prime is 2157844727. The reversal of 2157844724 is 4274487512.

2157844724 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157844727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38532914 + ... + 38532969.

It is an arithmetic number, because the mean of its divisors is an integer number (359640792).

Almost surely, 2^2157844724 is an apocalyptic number.

It is an amenable number.

2157844724 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2157844724 is a wasteful number, since it uses less digits than its factorization.

2157844724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77065894 (or 77065892 counting only the distinct ones).

The product of its digits is 501760, while the sum is 44.

The square root of 2157844724 is about 46452.6072895806. The cubic root of 2157844724 is about 1292.2307263661.

The spelling of 2157844724 in words is "two billion, one hundred fifty-seven million, eight hundred forty-four thousand, seven hundred twenty-four".