15423997 has 2 divisors, whose sum is σ = 15423998. Its totient is φ = 15423996.

The previous prime is 15423983. The next prime is 15424001. The reversal of 15423997 is 79932451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13697401 + 1726596 = 3701^2 + 1314^2 .

It is a cyclic number.

It is not a de Polignac number, because 15423997 - 2²³ = 7035389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15423917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7711998 + 7711999.

It is an arithmetic number, because the mean of its divisors is an integer number (7711999).

Almost surely, 2^15423997 is an apocalyptic number.

It is an amenable number.

15423997 is a deficient number, since it is larger than the sum of its proper divisors (1).

15423997 is an equidigital number, since it uses as much as digits as its factorization.

15423997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The square root of 15423997 is about 3927.3396848248. The cubic root of 15423997 is about 248.9233539895.

The spelling of 15423997 in words is "fifteen million, four hundred twenty-three thousand, nine hundred ninety-seven".