138497186 has 12 divisors (see below), whose sum is σ = 209171382. Its totient is φ = 68774784.

The previous prime is 138497171. The next prime is 138497197. The reversal of 138497186 is 681794831.

138497186 = T₁₇₀ + T₁₇₁ + ... + T₉₄₁.

It can be written as a sum of positive squares in only one way, i.e., 129527161 + 8970025 = 11381^2 + 2995^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138497186.

It is a congruent 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, 230915 + ... + 231513.

Almost surely, 2^138497186 is an apocalyptic number.

138497186 is a deficient number, since it is larger than the sum of its proper divisors (70674196).

138497186 is an frugal number, since it uses more digits than its factorization.

138497186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393 (or 794 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 138497186 is about 11768.4827399287. The cubic root of 138497186 is about 517.3847811512.

The spelling of 138497186 in words is "one hundred thirty-eight million, four hundred ninety-seven thousand, one hundred eighty-six".