72439847 has 2 divisors, whose sum is σ = 72439848. Its totient is φ = 72439846.

The previous prime is 72439841. The next prime is 72439877. The reversal of 72439847 is 74893427.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72439847 - 2¹⁶ = 72374311 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72439798 and 72439807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72439841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36219923 + 36219924.

It is an arithmetic number, because the mean of its divisors is an integer number (36219924).

Almost surely, 2^72439847 is an apocalyptic number.

72439847 is a deficient number, since it is larger than the sum of its proper divisors (1).

72439847 is an equidigital number, since it uses as much as digits as its factorization.

72439847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 44.

The square root of 72439847 is about 8511.1601441872. The cubic root of 72439847 is about 416.8621922508.

The spelling of 72439847 in words is "seventy-two million, four hundred thirty-nine thousand, eight hundred forty-seven".