2145539988 has 30 divisors (see below), whose sum is σ = 5608866186. Its totient is φ = 715179888.

The previous prime is 2145539987. The next prime is 2145540043. The reversal of 2145539988 is 8899355412.

2145539988 is a `hidden beast` number, since 2 + 1 + 4 + 553 + 9 + 9 + 88 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2055896964 + 89643024 = 45342^2 + 9468^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145539987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3310695 + ... + 3311342.

Almost surely, 2^2145539988 is an apocalyptic number.

It is an amenable number.

2145539988 is an abundant number, since it is smaller than the sum of its proper divisors (3463326198).

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

2145539988 is a wasteful number, since it uses less digits than its factorization.

2145539988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6622053 (or 6622042 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The square root of 2145539988 is about 46319.9739637233. The cubic root of 2145539988 is about 1289.7698020825.

The spelling of 2145539988 in words is "two billion, one hundred forty-five million, five hundred thirty-nine thousand, nine hundred eighty-eight".