972399817 has 2 divisors, whose sum is σ = 972399818. Its totient is φ = 972399816.

The previous prime is 972399787. The next prime is 972399839. The reversal of 972399817 is 718993279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 870309001 + 102090816 = 29501^2 + 10104^2 .

It is a cyclic number.

It is not a de Polignac number, because 972399817 - 2¹⁹ = 971875529 is a prime.

It is a super-2 number, since 2×972399817² = 1891122808203266978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (972399887) 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, 486199908 + 486199909.

It is an arithmetic number, because the mean of its divisors is an integer number (486199909).

Almost surely, 2^972399817 is an apocalyptic number.

It is an amenable number.

972399817 is a deficient number, since it is larger than the sum of its proper divisors (1).

972399817 is an equidigital number, since it uses as much as digits as its factorization.

972399817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 55.

The square root of 972399817 is about 31183.3259451265. The cubic root of 972399817 is about 990.7139756641.

The spelling of 972399817 in words is "nine hundred seventy-two million, three hundred ninety-nine thousand, eight hundred seventeen".