18409138632 has 24 divisors (see below), whose sum is σ = 49858083990. Its totient is φ = 6136379520.

The previous prime is 18409138591. The next prime is 18409138651. The reversal of 18409138632 is 23683190481.

18409138632 is a `hidden beast` number, since 1 + 8 + 4 + 0 + 9 + 1 + 3 + 8 + 632 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17708689476 + 700449156 = 133074^2 + 26466^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127841169 + ... + 127841312.

Almost surely, 2^18409138632 is an apocalyptic number.

18409138632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18409138632 is an abundant number, since it is smaller than the sum of its proper divisors (31448945358).

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

18409138632 is a wasteful number, since it uses less digits than its factorization.

18409138632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255682493 (or 255682486 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 18409138632 in words is "eighteen billion, four hundred nine million, one hundred thirty-eight thousand, six hundred thirty-two".