2161925784 has 48 divisors (see below), whose sum is σ = 5885591400. Its totient is φ = 716903424.

The previous prime is 2161925767. The next prime is 2161925807. The reversal of 2161925784 is 4875291612.

2161925784 is a `hidden beast` number, since 2 + 1 + 619 + 25 + 7 + 8 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63894 + ... + 91685.

Almost surely, 2^2161925784 is an apocalyptic number.

2161925784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2161925784 is an abundant number, since it is smaller than the sum of its proper divisors (3723665616).

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

2161925784 is a wasteful number, since it uses less digits than its factorization.

2161925784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155784 (or 155777 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 2161925784 is about 46496.5136757585. The cubic root of 2161925784 is about 1293.0448643373.

The spelling of 2161925784 in words is "two billion, one hundred sixty-one million, nine hundred twenty-five thousand, seven hundred eighty-four".