2002155138 has 16 divisors (see below), whose sum is σ = 4449233760. Its totient is φ = 667385028.

The previous prime is 2002155107. The next prime is 2002155163. The reversal of 2002155138 is 8315512002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18538420 + ... + 18538527.

It is an arithmetic number, because the mean of its divisors is an integer number (278077110).

Almost surely, 2^2002155138 is an apocalyptic number.

2002155138 is an abundant number, since it is smaller than the sum of its proper divisors (2447078622).

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

2002155138 is a wasteful number, since it uses less digits than its factorization.

2002155138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37076958 (or 37076952 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2002155138 is about 44745.4482377817. The cubic root of 2002155138 is about 1260.3734380625.

The spelling of 2002155138 in words is "two billion, two million, one hundred fifty-five thousand, one hundred thirty-eight".