7980138 has 12 divisors (see below), whose sum is σ = 17290338. Its totient is φ = 2660040.

The previous prime is 7980121. The next prime is 7980143. The reversal of 7980138 is 8310897.

It can be written as a sum of positive squares in only one way, i.e., 5461569 + 2518569 = 2337^2 + 1587^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 221653 + ... + 221688.

Almost surely, 2^7980138 is an apocalyptic number.

7980138 is an abundant number, since it is smaller than the sum of its proper divisors (9310200).

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

7980138 is a wasteful number, since it uses less digits than its factorization.

7980138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443349 (or 443346 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 7980138 is about 2824.9138039947. The cubic root of 7980138 is about 199.8343461652.

It can be divided in two parts, 7980 and 138, that added together give a palindrome (8118).

The spelling of 7980138 in words is "seven million, nine hundred eighty thousand, one hundred thirty-eight".