72186047 has 2 divisors, whose sum is σ = 72186048. Its totient is φ = 72186046.

The previous prime is 72186043. The next prime is 72186071. The reversal of 72186047 is 74068127.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72186047 - 2² = 72186043 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72185998 and 72186016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72186041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36093023 + 36093024.

It is an arithmetic number, because the mean of its divisors is an integer number (36093024).

Almost surely, 2^72186047 is an apocalyptic number.

72186047 is a deficient number, since it is larger than the sum of its proper divisors (1).

72186047 is an equidigital number, since it uses as much as digits as its factorization.

72186047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 72186047 is about 8496.2372259724. The cubic root of 72186047 is about 416.3747835958.

It can be divided in two parts, 721 and 86047, that added together give a palindrome (86768).

The spelling of 72186047 in words is "seventy-two million, one hundred eighty-six thousand, forty-seven".