998759438 has 4 divisors (see below), whose sum is σ = 1498139160. Its totient is φ = 499379718.

The previous prime is 998759423. The next prime is 998759459. The reversal of 998759438 is 834957899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834957899 = 769 ⋅1085771.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 249689858 + ... + 249689861.

It is an arithmetic number, because the mean of its divisors is an integer number (374534790).

Almost surely, 2^998759438 is an apocalyptic number.

998759438 is a deficient number, since it is larger than the sum of its proper divisors (499379722).

998759438 is a wasteful number, since it uses less digits than its factorization.

998759438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499379721.

The product of its digits is 19595520, while the sum is 62.

The square root of 998759438 is about 31603.1555070059. The cubic root of 998759438 is about 999.5863082160.

The spelling of 998759438 in words is "nine hundred ninety-eight million, seven hundred fifty-nine thousand, four hundred thirty-eight".