72421873 has 2 divisors, whose sum is σ = 72421874. Its totient is φ = 72421872.

The previous prime is 72421861. The next prime is 72421883. The reversal of 72421873 is 37812427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49449024 + 22972849 = 7032^2 + 4793^2 .

It is a cyclic number.

It is not a de Polignac number, because 72421873 - 2²¹ = 70324721 is a prime.

It is not a weakly prime, because it can be changed into another prime (72421883) 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, 36210936 + 36210937.

It is an arithmetic number, because the mean of its divisors is an integer number (36210937).

Almost surely, 2^72421873 is an apocalyptic number.

It is an amenable number.

72421873 is a deficient number, since it is larger than the sum of its proper divisors (1).

72421873 is an equidigital number, since it uses as much as digits as its factorization.

72421873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 34.

The square root of 72421873 is about 8510.1041709253. The cubic root of 72421873 is about 416.8277116846.

The spelling of 72421873 in words is "seventy-two million, four hundred twenty-one thousand, eight hundred seventy-three".