998623158 has 32 divisors (see below), whose sum is σ = 2172193632. Its totient is φ = 304224000.

The previous prime is 998623127. The next prime is 998623159. The reversal of 998623158 is 851326899.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 998623158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998623159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55503 + ... + 71258.

It is an arithmetic number, because the mean of its divisors is an integer number (67881051).

Almost surely, 2^998623158 is an apocalyptic number.

998623158 is an abundant number, since it is smaller than the sum of its proper divisors (1173570474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998623158 is a wasteful number, since it uses less digits than its factorization.

998623158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126880.

The product of its digits is 933120, while the sum is 51.

The square root of 998623158 is about 31600.9993196418. Note that the first 3 decimals coincide. The cubic root of 998623158 is about 999.5408418727.

The spelling of 998623158 in words is "nine hundred ninety-eight million, six hundred twenty-three thousand, one hundred fifty-eight".