72013979 has 2 divisors, whose sum is σ = 72013980. Its totient is φ = 72013978.

The previous prime is 72013957. The next prime is 72013993. The reversal of 72013979 is 97931027.

It is a strong prime.

It is an emirp because it is prime and its reverse (97931027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72013979 - 2²⁴ = 55236763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72013919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36006989 + 36006990.

It is an arithmetic number, because the mean of its divisors is an integer number (36006990).

Almost surely, 2^72013979 is an apocalyptic number.

72013979 is a deficient number, since it is larger than the sum of its proper divisors (1).

72013979 is an equidigital number, since it uses as much as digits as its factorization.

72013979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 72013979 is about 8486.1050547351. The cubic root of 72013979 is about 416.0436864716.

The spelling of 72013979 in words is "seventy-two million, thirteen thousand, nine hundred seventy-nine".