2138620340 has 12 divisors (see below), whose sum is σ = 4491102756. Its totient is φ = 855448128.

The previous prime is 2138620333. The next prime is 2138620357. The reversal of 2138620340 is 430268312.

It can be written as a sum of positive squares in 2 ways, for example, as 1493358736 + 645261604 = 38644^2 + 25402^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53465489 + ... + 53465528.

It is an arithmetic number, because the mean of its divisors is an integer number (374258563).

Almost surely, 2^2138620340 is an apocalyptic number.

2138620340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2138620340 is an abundant number, since it is smaller than the sum of its proper divisors (2352482416).

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

2138620340 is a wasteful number, since it uses less digits than its factorization.

2138620340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106931026 (or 106931024 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 2138620340 is about 46245.2196448455. The cubic root of 2138620340 is about 1288.3817498425.

Adding to 2138620340 its reverse (430268312), we get a palindrome (2568888652).

The spelling of 2138620340 in words is "two billion, one hundred thirty-eight million, six hundred twenty thousand, three hundred forty".