186747138 has 18 divisors (see below), whose sum is σ = 404744457. Its totient is φ = 62229720.

The previous prime is 186747089. The next prime is 186747139. The reversal of 186747138 is 831747681.

It can be written as a sum of positive squares in 2 ways, for example, as 171793449 + 14953689 = 13107^2 + 3867^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=9663.

It is a junction number, because it is equal to n+sod(n) for n = 186747093 and 186747102.

It is not an unprimeable number, because it can be changed into a prime (186747139) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 56368 + ... + 59588.

Almost surely, 2^186747138 is an apocalyptic number.

186747138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

186747138 is an abundant number, since it is smaller than the sum of its proper divisors (217997319).

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

186747138 is an frugal number, since it uses more digits than its factorization.

186747138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6450 (or 3226 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 186747138 is about 13665.5456532112. The cubic root of 186747138 is about 571.5900386976.

Multiplying 186747138 by its product of digits (225792), we get a square (42166009783296 = 6493536²).

The spelling of 186747138 in words is "one hundred eighty-six million, seven hundred forty-seven thousand, one hundred thirty-eight".