15393421 has 2 divisors, whose sum is σ = 15393422. Its totient is φ = 15393420.

The previous prime is 15393397. The next prime is 15393431. The reversal of 15393421 is 12439351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9922500 + 5470921 = 3150^2 + 2339^2 .

It is an emirp because it is prime and its reverse (12439351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15393421 - 2⁷ = 15393293 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15393421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15393431) 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, 7696710 + 7696711.

It is an arithmetic number, because the mean of its divisors is an integer number (7696711).

Almost surely, 2^15393421 is an apocalyptic number.

It is an amenable number.

15393421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15393421 is an equidigital number, since it uses as much as digits as its factorization.

15393421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 28.

The square root of 15393421 is about 3923.4450423066. The cubic root of 15393421 is about 248.7587594872.

The spelling of 15393421 in words is "fifteen million, three hundred ninety-three thousand, four hundred twenty-one".