72000421 has 2 divisors, whose sum is σ = 72000422. Its totient is φ = 72000420.

The previous prime is 72000371. The next prime is 72000449. The reversal of 72000421 is 12400027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51624225 + 20376196 = 7185^2 + 4514^2 .

It is a cyclic number.

It is not a de Polignac number, because 72000421 - 2⁹ = 71999909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72000395 and 72000404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72000121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36000210 + 36000211.

It is an arithmetic number, because the mean of its divisors is an integer number (36000211).

Almost surely, 2^72000421 is an apocalyptic number.

It is an amenable number.

72000421 is a deficient number, since it is larger than the sum of its proper divisors (1).

72000421 is an equidigital number, since it uses as much as digits as its factorization.

72000421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 72000421 is about 8485.3061818652. The cubic root of 72000421 is about 416.0175754563.

Adding to 72000421 its reverse (12400027), we get a palindrome (84400448).

The spelling of 72000421 in words is "seventy-two million, four hundred twenty-one", and thus it is an aban number.