72421493 has 2 divisors, whose sum is σ = 72421494. Its totient is φ = 72421492.

The previous prime is 72421477. The next prime is 72421499. The reversal of 72421493 is 39412427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57729604 + 14691889 = 7598^2 + 3833^2 .

It is an emirp because it is prime and its reverse (39412427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72421493 - 2⁴ = 72421477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72421499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36210746 + 36210747.

It is an arithmetic number, because the mean of its divisors is an integer number (36210747).

Almost surely, 2^72421493 is an apocalyptic number.

It is an amenable number.

72421493 is a deficient number, since it is larger than the sum of its proper divisors (1).

72421493 is an equidigital number, since it uses as much as digits as its factorization.

72421493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 72421493 is about 8510.0818444948. The cubic root of 72421493 is about 416.8269826470.

The spelling of 72421493 in words is "seventy-two million, four hundred twenty-one thousand, four hundred ninety-three".