72981443 has 2 divisors, whose sum is σ = 72981444. Its totient is φ = 72981442.

The previous prime is 72981421. The next prime is 72981463. The reversal of 72981443 is 34418927.

It is a strong prime.

It is an emirp because it is prime and its reverse (34418927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72981443 - 2⁶ = 72981379 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72981397 and 72981406.

It is not a weakly prime, because it can be changed into another prime (72981463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36490721 + 36490722.

It is an arithmetic number, because the mean of its divisors is an integer number (36490722).

Almost surely, 2^72981443 is an apocalyptic number.

72981443 is a deficient number, since it is larger than the sum of its proper divisors (1).

72981443 is an equidigital number, since it uses as much as digits as its factorization.

72981443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 72981443 is about 8542.9177100099. The cubic root of 72981443 is about 417.8985029394.

The spelling of 72981443 in words is "seventy-two million, nine hundred eighty-one thousand, four hundred forty-three".