998820381 has 16 divisors (see below), whose sum is σ = 1458515520. Its totient is φ = 604239360.

The previous prime is 998820377. The next prime is 998820391. The reversal of 998820381 is 183028899.

It is a happy number.

998820381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 998820381 - 2² = 998820377 is a prime.

It is a super-2 number, since 2×998820381² = 1995284307001970322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 998820381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998820391) 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, 214740 + ... + 219341.

It is an arithmetic number, because the mean of its divisors is an integer number (91157220).

Almost surely, 2^998820381 is an apocalyptic number.

It is an amenable number.

998820381 is a deficient number, since it is larger than the sum of its proper divisors (459695139).

998820381 is a wasteful number, since it uses less digits than its factorization.

998820381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434156.

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 998820381 is about 31604.1196839906. The cubic root of 998820381 is about 999.6066389540.

The spelling of 998820381 in words is "nine hundred ninety-eight million, eight hundred twenty thousand, three hundred eighty-one".