2106557388 has 48 divisors (see below), whose sum is σ = 5881560160. Its totient is φ = 648171072.

The previous prime is 2106557333. The next prime is 2106557389. The reversal of 2106557388 is 8837556012.

2106557388 is a `hidden beast` number, since 2 + 10 + 6 + 557 + 3 + 88 = 666.

It is not an unprimeable number, because it can be changed into a prime (2106557389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 748795 + ... + 751602.

Almost surely, 2^2106557388 is an apocalyptic number.

It is an amenable number.

2106557388 is an abundant number, since it is smaller than the sum of its proper divisors (3775002772).

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

2106557388 is a wasteful number, since it uses less digits than its factorization.

2106557388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500423 (or 1500415 counting only the distinct ones).

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

The square root of 2106557388 is about 45897.2481528032. The cubic root of 2106557388 is about 1281.9106775675.

The spelling of 2106557388 in words is "two billion, one hundred six million, five hundred fifty-seven thousand, three hundred eighty-eight".