1198009381 has 8 divisors (see below), whose sum is σ = 1235052504. Its totient is φ = 1161338880.

The previous prime is 1198009361. The next prime is 1198009399. The reversal of 1198009381 is 1839008911.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 54893281 + 1143116100 = 7409^2 + 33810^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1198009381 - 2¹¹ = 1198007333 is a prime.

It is a super-2 number, since 2×1198009381² = 2870452953928006322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198009321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86620 + ... + 99493.

It is an arithmetic number, because the mean of its divisors is an integer number (154381563).

Almost surely, 2^1198009381 is an apocalyptic number.

It is an amenable number.

1198009381 is a deficient number, since it is larger than the sum of its proper divisors (37043123).

1198009381 is a wasteful number, since it uses less digits than its factorization.

1198009381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186311.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 1198009381 is about 34612.2721155373. The cubic root of 1198009381 is about 1062.0706472107.

The spelling of 1198009381 in words is "one billion, one hundred ninety-eight million, nine thousand, three hundred eighty-one".