126138618 has 24 divisors (see below), whose sum is σ = 273780000. Its totient is φ = 41972424.

The previous prime is 126138611. The next prime is 126138619. The reversal of 126138618 is 816831621.

126138618 is a `hidden beast` number, since 1 + 2 + 6 + 1 + 38 + 618 = 666.

It is not an unprimeable number, because it can be changed into a prime (126138611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4933 + ... + 16631.

It is an arithmetic number, because the mean of its divisors is an integer number (11407500).

Almost surely, 2^126138618 is an apocalyptic number.

126138618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

126138618 is an abundant number, since it is smaller than the sum of its proper divisors (147641382).

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

126138618 is a wasteful number, since it uses less digits than its factorization.

126138618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12306 (or 12303 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 126138618 is about 11231.1449995092. The cubic root of 126138618 is about 501.5135709162.

It can be divided in two parts, 126138 and 618, that added together give a triangular number (126756 = T₅₀₃).

The spelling of 126138618 in words is "one hundred twenty-six million, one hundred thirty-eight thousand, six hundred eighteen".