1798797138 has 16 divisors (see below), whose sum is σ = 3605303520. Its totient is φ = 598314176.

The previous prime is 1798797137. The next prime is 1798797191. The reversal of 1798797138 is 8317978971.

It is a super-2 number, since 2×1798797138² = 6471342287353982088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1798797131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318183 + ... + 323786.

It is an arithmetic number, because the mean of its divisors is an integer number (225331470).

Almost surely, 2^1798797138 is an apocalyptic number.

1798797138 is an abundant number, since it is smaller than the sum of its proper divisors (1806506382).

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

1798797138 is a wasteful number, since it uses less digits than its factorization.

1798797138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642441.

The product of its digits is 5334336, while the sum is 60.

The square root of 1798797138 is about 42412.2286375050. The cubic root of 1798797138 is about 1216.1693739321.

The spelling of 1798797138 in words is "one billion, seven hundred ninety-eight million, seven hundred ninety-seven thousand, one hundred thirty-eight".