999998370 has 144 divisors (see below), whose sum is σ = 3156304320. Its totient is φ = 218611008.

The previous prime is 999998369. The next prime is 999998423. The reversal of 999998370 is 73899999.

999998370 is a `hidden beast` number, since 99 + 99 + 98 + 370 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 999998298 and 999998307.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 96501 + ... + 106359.

It is an arithmetic number, because the mean of its divisors is an integer number (21918780).

Almost surely, 2^999998370 is an apocalyptic number.

999998370 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 999998370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1578152160).

999998370 is an abundant number, since it is smaller than the sum of its proper divisors (2156305950).

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

999998370 is a wasteful number, since it uses less digits than its factorization.

999998370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9909 (or 9899 counting only the distinct ones).

The product of its (nonzero) digits is 9920232, while the sum is 63.

The square root of 999998370 is about 31622.7508291104. The cubic root of 999998370 is about 999.9994566664. Note that the first 3 decimals are identical.

The spelling of 999998370 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, three hundred seventy".