1998401260 has 24 divisors (see below), whose sum is σ = 4197533760. Its totient is φ = 799190784.

The previous prime is 1998401257. The next prime is 1998401309. The reversal of 1998401260 is 621048991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134061 + ... + 148219.

It is an arithmetic number, because the mean of its divisors is an integer number (174897240).

Almost surely, 2^1998401260 is an apocalyptic number.

1998401260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1998401260 is an abundant number, since it is smaller than the sum of its proper divisors (2199132500).

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

1998401260 is a wasteful number, since it uses less digits than its factorization.

1998401260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21225 (or 21223 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1998401260 is about 44703.4815198995. The cubic root of 1998401260 is about 1259.5852460386.

The spelling of 1998401260 in words is "one billion, nine hundred ninety-eight million, four hundred one thousand, two hundred sixty".