998886457 has 2 divisors, whose sum is σ = 998886458. Its totient is φ = 998886456.

The previous prime is 998886419. The next prime is 998886467. The reversal of 998886457 is 754688899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 994708521 + 4177936 = 31539^2 + 2044^2 .

It is a cyclic number.

It is not a de Polignac number, because 998886457 - 2¹¹ = 998884409 is a prime.

It is not a weakly prime, because it can be changed into another prime (998886467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499443228 + 499443229.

It is an arithmetic number, because the mean of its divisors is an integer number (499443229).

Almost surely, 2^998886457 is an apocalyptic number.

It is an amenable number.

998886457 is a deficient number, since it is larger than the sum of its proper divisors (1).

998886457 is an equidigital number, since it uses as much as digits as its factorization.

998886457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34836480, while the sum is 64.

The square root of 998886457 is about 31605.1650367468. The cubic root of 998886457 is about 999.6286811394.

The spelling of 998886457 in words is "nine hundred ninety-eight million, eight hundred eighty-six thousand, four hundred fifty-seven".