72401839 has 2 divisors, whose sum is σ = 72401840. Its totient is φ = 72401838.

The previous prime is 72401821. The next prime is 72401843. The reversal of 72401839 is 93810427.

It is a strong prime.

It is an emirp because it is prime and its reverse (93810427) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72401839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72401899) 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, 36200919 + 36200920.

It is an arithmetic number, because the mean of its divisors is an integer number (36200920).

Almost surely, 2^72401839 is an apocalyptic number.

72401839 is a deficient number, since it is larger than the sum of its proper divisors (1).

72401839 is an equidigital number, since it uses as much as digits as its factorization.

72401839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 72401839 is about 8508.9270181381. The cubic root of 72401839 is about 416.7892725769.

The spelling of 72401839 in words is "seventy-two million, four hundred one thousand, eight hundred thirty-nine".