2138251280 has 40 divisors (see below), whose sum is σ = 5423385024. Its totient is φ = 777545600.

The previous prime is 2138251261. The next prime is 2138251289. The reversal of 2138251280 is 821528312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (2138251289) 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, 1214036 + ... + 1215795.

Almost surely, 2^2138251280 is an apocalyptic number.

2138251280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2138251280 is an abundant number, since it is smaller than the sum of its proper divisors (3285133744).

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

2138251280 is a wasteful number, since it uses less digits than its factorization.

2138251280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429855 (or 2429849 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 2138251280 is about 46241.2292224158. The cubic root of 2138251280 is about 1288.3076339099.

Adding to 2138251280 its reverse (821528312), we get a palindrome (2959779592).

The spelling of 2138251280 in words is "two billion, one hundred thirty-eight million, two hundred fifty-one thousand, two hundred eighty".