180138459 has 32 divisors (see below), whose sum is σ = 258059520. Its totient is φ = 111549312.

The previous prime is 180138421. The next prime is 180138463. The reversal of 180138459 is 954831081.

It is not a de Polignac number, because 180138459 - 2¹⁶ = 180072923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (180138479) 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 31 ways as a sum of consecutive naturals, for example, 344172 + ... + 344694.

It is an arithmetic number, because the mean of its divisors is an integer number (8064360).

Almost surely, 2^180138459 is an apocalyptic number.

180138459 is a deficient number, since it is larger than the sum of its proper divisors (77921061).

180138459 is a wasteful number, since it uses less digits than its factorization.

180138459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 180138459 is about 13421.5669353470. The cubic root of 180138459 is about 564.7663523436.

The spelling of 180138459 in words is "one hundred eighty million, one hundred thirty-eight thousand, four hundred fifty-nine".