2138998836 has 24 divisors (see below), whose sum is σ = 5374920544. Its totient is φ = 658153440.

The previous prime is 2138998831. The next prime is 2138998847. The reversal of 2138998836 is 6388998312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138998831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6855610 + ... + 6855921.

Almost surely, 2^2138998836 is an apocalyptic number.

2138998836 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2138998836 is an abundant number, since it is smaller than the sum of its proper divisors (3235921708).

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

2138998836 is a wasteful number, since it uses less digits than its factorization.

2138998836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13711551 (or 13711549 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 57.

The square root of 2138998836 is about 46249.3117354194. The cubic root of 2138998836 is about 1288.4577518899.

The spelling of 2138998836 in words is "two billion, one hundred thirty-eight million, nine hundred ninety-eight thousand, eight hundred thirty-six".