72871439 has 2 divisors, whose sum is σ = 72871440. Its totient is φ = 72871438.

The previous prime is 72871423. The next prime is 72871451. The reversal of 72871439 is 93417827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72871439 - 2⁴ = 72871423 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72871396 and 72871405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72871459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36435719 + 36435720.

It is an arithmetic number, because the mean of its divisors is an integer number (36435720).

Almost surely, 2^72871439 is an apocalyptic number.

72871439 is a deficient number, since it is larger than the sum of its proper divisors (1).

72871439 is an equidigital number, since it uses as much as digits as its factorization.

72871439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 72871439 is about 8536.4769665243. The cubic root of 72871439 is about 417.6884329942.

The spelling of 72871439 in words is "seventy-two million, eight hundred seventy-one thousand, four hundred thirty-nine".