998156798 has 8 divisors (see below), whose sum is σ = 1510485408. Its totient is φ = 494661664.

The previous prime is 998156777. The next prime is 998156801. The reversal of 998156798 is 897651899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×998156798² = 1992633986787225608, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 998156798.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2208086 + ... + 2208537.

It is an arithmetic number, because the mean of its divisors is an integer number (188810676).

Almost surely, 2^998156798 is an apocalyptic number.

998156798 is a deficient number, since it is larger than the sum of its proper divisors (512328610).

998156798 is a wasteful number, since it uses less digits than its factorization.

998156798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4416738.

The product of its digits is 9797760, while the sum is 62.

The square root of 998156798 is about 31593.6195773767. The cubic root of 998156798 is about 999.3852214581.

The spelling of 998156798 in words is "nine hundred ninety-eight million, one hundred fifty-six thousand, seven hundred ninety-eight".