998622156 has 144 divisors (see below), whose sum is σ = 2809943136. Its totient is φ = 275014656.

The previous prime is 998622151. The next prime is 998622167. The reversal of 998622156 is 651226899.

It is not an unprimeable number, because it can be changed into a prime (998622151) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4285816 + ... + 4286048.

It is an arithmetic number, because the mean of its divisors is an integer number (19513494).

Almost surely, 2^998622156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998622156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1404971568).

998622156 is an abundant number, since it is smaller than the sum of its proper divisors (1811320980).

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

998622156 is a wasteful number, since it uses less digits than its factorization.

998622156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 479 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The square root of 998622156 is about 31600.9834657088. The cubic root of 998622156 is about 999.5405075657.

The spelling of 998622156 in words is "nine hundred ninety-eight million, six hundred twenty-two thousand, one hundred fifty-six".