1198381 has 8 divisors (see below), whose sum is σ = 1279800. Its totient is φ = 1118208.

The previous prime is 1198363. The next prime is 1198397. The reversal of 1198381 is 1838911.

It can be written as a sum of positive squares in 4 ways, for example, as 265225 + 933156 = 515^2 + 966^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1198381 is a prime.

It is a super-2 number, since 2×1198381² = 2872234042322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2445 + ... + 2893.

It is an arithmetic number, because the mean of its divisors is an integer number (159975).

2^1198381 is an apocalyptic number.

It is an amenable number.

1198381 is a deficient number, since it is larger than the sum of its proper divisors (81419).

1198381 is a wasteful number, since it uses less digits than its factorization.

1198381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623.

The product of its digits is 1728, while the sum is 31.

The square root of 1198381 is about 1094.7058965768. The cubic root of 1198381 is about 106.2180452925.

The spelling of 1198381 in words is "one million, one hundred ninety-eight thousand, three hundred eighty-one".