72943979 has 2 divisors, whose sum is σ = 72943980. Its totient is φ = 72943978.

The previous prime is 72943963. The next prime is 72944029. The reversal of 72943979 is 97934927.

It is an a-pointer prime, because the next prime (72944029) can be obtained adding 72943979 to its sum of digits (50).

It is a weak prime.

It is an emirp because it is prime and its reverse (97934927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72943979 - 2⁴ = 72943963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72942979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36471989 + 36471990.

It is an arithmetic number, because the mean of its divisors is an integer number (36471990).

Almost surely, 2^72943979 is an apocalyptic number.

72943979 is a deficient number, since it is larger than the sum of its proper divisors (1).

72943979 is an equidigital number, since it uses as much as digits as its factorization.

72943979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 50.

The square root of 72943979 is about 8540.7247350562. The cubic root of 72943979 is about 417.8269832554.

The spelling of 72943979 in words is "seventy-two million, nine hundred forty-three thousand, nine hundred seventy-nine".