2138635920 has 80 divisors (see below), whose sum is σ = 6634218240. Its totient is φ = 569920512.

The previous prime is 2138635907. The next prime is 2138635949. The reversal of 2138635920 is 295368312.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 684121 + ... + 687239.

It is an arithmetic number, because the mean of its divisors is an integer number (82927728).

Almost surely, 2^2138635920 is an apocalyptic number.

2138635920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2138635920 is an abundant number, since it is smaller than the sum of its proper divisors (4495582320).

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

2138635920 is a wasteful number, since it uses less digits than its factorization.

2138635920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5992 (or 5986 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 2138635920 is about 46245.3880943819. The cubic root of 2138635920 is about 1288.3848784856.

The spelling of 2138635920 in words is "two billion, one hundred thirty-eight million, six hundred thirty-five thousand, nine hundred twenty".