72418186 has 4 divisors (see below), whose sum is σ = 108627282. Its totient is φ = 36209092.

The previous prime is 72418141. The next prime is 72418187. The reversal of 72418186 is 68181427.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 46662561 + 25755625 = 6831^2 + 5075^2 .

It is not an unprimeable number, because it can be changed into a prime (72418187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18104545 + ... + 18104548.

Almost surely, 2^72418186 is an apocalyptic number.

72418186 is a deficient number, since it is larger than the sum of its proper divisors (36209096).

72418186 is a wasteful number, since it uses less digits than its factorization.

72418186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36209095.

The product of its digits is 21504, while the sum is 37.

The square root of 72418186 is about 8509.8875433228. The cubic root of 72418186 is about 416.8206379936.

The spelling of 72418186 in words is "seventy-two million, four hundred eighteen thousand, one hundred eighty-six".