2139238890 has 64 divisors (see below), whose sum is σ = 5798200320. Its totient is φ = 561107520.

The previous prime is 2139238889. The next prime is 2139238891. The reversal of 2139238890 is 988329312.

It is an interprime number because it is at equal distance from previous prime (2139238889) and next prime (2139238891).

It is a super-3 number, since 3×2139238890³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2139238891) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 48474 + ... + 81413.

It is an arithmetic number, because the mean of its divisors is an integer number (90596880).

Almost surely, 2^2139238890 is an apocalyptic number.

2139238890 is an abundant number, since it is smaller than the sum of its proper divisors (3658961430).

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

2139238890 is a wasteful number, since it uses less digits than its factorization.

2139238890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129964 (or 129958 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 2139238890 is about 46251.9068796088. The cubic root of 2139238890 is about 1288.5059501190.

The spelling of 2139238890 in words is "two billion, one hundred thirty-nine million, two hundred thirty-eight thousand, eight hundred ninety".