2157944508 has 36 divisors (see below), whose sum is σ = 5581664088. Its totient is φ = 702586080.

The previous prime is 2157944507. The next prime is 2157944519. The reversal of 2157944508 is 8054497512.

2157944508 is a `hidden beast` number, since 2 + 1 + 57 + 94 + 4 + 508 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157944507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 695463 + ... + 698558.

Almost surely, 2^2157944508 is an apocalyptic number.

It is an amenable number.

2157944508 is an abundant number, since it is smaller than the sum of its proper divisors (3423719580).

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

2157944508 is a wasteful number, since it uses less digits than its factorization.

2157944508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394074 (or 1394069 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 2157944508 is about 46453.6813180613. The cubic root of 2157944508 is about 1292.2506446920.

The spelling of 2157944508 in words is "two billion, one hundred fifty-seven million, nine hundred forty-four thousand, five hundred eight".