180187138 has 4 divisors (see below), whose sum is σ = 270280710. Its totient is φ = 90093568.

The previous prime is 180187123. The next prime is 180187153. The reversal of 180187138 is 831781081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831781081 = 67 ⋅12414643.

It is an interprime number because it is at equal distance from previous prime (180187123) and next prime (180187153).

It can be written as a sum of positive squares in only one way, i.e., 176013289 + 4173849 = 13267^2 + 2043^2 .

It is a junction number, because it is equal to n+sod(n) for n = 180187097 and 180187106.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45046783 + ... + 45046786.

Almost surely, 2^180187138 is an apocalyptic number.

180187138 is a deficient number, since it is larger than the sum of its proper divisors (90093572).

180187138 is an equidigital number, since it uses as much as digits as its factorization.

180187138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90093571.

The product of its (nonzero) digits is 10752, while the sum is 37.

The square root of 180187138 is about 13423.3802747296. The cubic root of 180187138 is about 564.8172202248.

The spelling of 180187138 in words is "one hundred eighty million, one hundred eighty-seven thousand, one hundred thirty-eight".