72286421 has 2 divisors, whose sum is σ = 72286422. Its totient is φ = 72286420.

The previous prime is 72286399. The next prime is 72286427. The reversal of 72286421 is 12468227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59505796 + 12780625 = 7714^2 + 3575^2 .

It is an emirp because it is prime and its reverse (12468227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72286421 - 2²² = 68092117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72286427) 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, 36143210 + 36143211.

It is an arithmetic number, because the mean of its divisors is an integer number (36143211).

Almost surely, 2^72286421 is an apocalyptic number.

It is an amenable number.

72286421 is a deficient number, since it is larger than the sum of its proper divisors (1).

72286421 is an equidigital number, since it uses as much as digits as its factorization.

72286421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

The square root of 72286421 is about 8502.1421418370. The cubic root of 72286421 is about 416.5676825848.

The spelling of 72286421 in words is "seventy-two million, two hundred eighty-six thousand, four hundred twenty-one".