2138305890 has 64 divisors (see below), whose sum is σ = 5989883904. Its totient is φ = 478354368.

The previous prime is 2138305867. The next prime is 2138305891. The reversal of 2138305890 is 985038312.

It is not an unprimeable number, because it can be changed into a prime (2138305891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98454 + ... + 118193.

It is an arithmetic number, because the mean of its divisors is an integer number (93591936).

Almost surely, 2^2138305890 is an apocalyptic number.

2138305890 is an abundant number, since it is smaller than the sum of its proper divisors (3851578014).

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

2138305890 is a wasteful number, since it uses less digits than its factorization.

2138305890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216711.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 2138305890 is about 46241.8197090037. The cubic root of 2138305890 is about 1288.3186014206.

The spelling of 2138305890 in words is "two billion, one hundred thirty-eight million, three hundred five thousand, eight hundred ninety".