190686138 has 16 divisors (see below), whose sum is σ = 381511296. Its totient is φ = 63538880.

The previous prime is 190686137. The next prime is 190686163. The reversal of 190686138 is 831686091.

It is a super-2 number, since 2×190686138² = 72722406450710088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 190686138.

It is not an unprimeable number, because it can be changed into a prime (190686131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23218 + ... + 30338.

It is an arithmetic number, because the mean of its divisors is an integer number (23844456).

Almost surely, 2^190686138 is an apocalyptic number.

190686138 is an abundant number, since it is smaller than the sum of its proper divisors (190825158).

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

190686138 is a wasteful number, since it uses less digits than its factorization.

190686138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11589.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 190686138 is about 13808.9151637629. The cubic root of 190686138 is about 575.5809005274.

The spelling of 190686138 in words is "one hundred ninety million, six hundred eighty-six thousand, one hundred thirty-eight".