15420017 has 2 divisors, whose sum is σ = 15420018. Its totient is φ = 15420016.

The previous prime is 15420011. The next prime is 15420043. The reversal of 15420017 is 71002451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7890481 + 7529536 = 2809^2 + 2744^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15420017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15420011) 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, 7710008 + 7710009.

It is an arithmetic number, because the mean of its divisors is an integer number (7710009).

Almost surely, 2^15420017 is an apocalyptic number.

It is an amenable number.

15420017 is a deficient number, since it is larger than the sum of its proper divisors (1).

15420017 is an equidigital number, since it uses as much as digits as its factorization.

15420017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 15420017 is about 3926.8329478092. The cubic root of 15420017 is about 248.9019414643.

Adding to 15420017 its reverse (71002451), we get a palindrome (86422468).

The spelling of 15420017 in words is "fifteen million, four hundred twenty thousand, seventeen".