985400957 has 2 divisors, whose sum is σ = 985400958. Its totient is φ = 985400956.

The previous prime is 985400861. The next prime is 985400987. The reversal of 985400957 is 759004589.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 753722116 + 231678841 = 27454^2 + 15221^2 .

It is a cyclic number.

It is not a de Polignac number, because 985400957 - 2¹² = 985396861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985400987) 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, 492700478 + 492700479.

It is an arithmetic number, because the mean of its divisors is an integer number (492700479).

Almost surely, 2^985400957 is an apocalyptic number.

It is an amenable number.

985400957 is a deficient number, since it is larger than the sum of its proper divisors (1).

985400957 is an equidigital number, since it uses as much as digits as its factorization.

985400957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 47.

The square root of 985400957 is about 31391.0967791825. The cubic root of 985400957 is about 995.1097770347.

The spelling of 985400957 in words is "nine hundred eighty-five million, four hundred thousand, nine hundred fifty-seven".