72185987 has 2 divisors, whose sum is σ = 72185988. Its totient is φ = 72185986.

The previous prime is 72185957. The next prime is 72186019. The reversal of 72185987 is 78958127.

It is a weak prime.

It is an emirp because it is prime and its reverse (78958127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72185987 - 2¹⁸ = 71923843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72185957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36092993 + 36092994.

It is an arithmetic number, because the mean of its divisors is an integer number (36092994).

Almost surely, 2^72185987 is an apocalyptic number.

72185987 is a deficient number, since it is larger than the sum of its proper divisors (1).

72185987 is an equidigital number, since it uses as much as digits as its factorization.

72185987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 47.

The square root of 72185987 is about 8496.2336949969. The cubic root of 72185987 is about 416.3746682342.

The spelling of 72185987 in words is "seventy-two million, one hundred eighty-five thousand, nine hundred eighty-seven".