1198986381 has 20 divisors (see below), whose sum is σ = 1794454684. Its totient is φ = 797817600.

The previous prime is 1198986379. The next prime is 1198986407. The reversal of 1198986381 is 1836898911.

It can be written as a sum of positive squares in 2 ways, for example, as 601917156 + 597069225 = 24534^2 + 24435^2 .

It is not a de Polignac number, because 1198986381 - 2¹ = 1198986379 is a prime.

It is a super-2 number, since 2×1198986381² = 2875136683646954322, 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 (1198986311) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30141 + ... + 57501.

Almost surely, 2^1198986381 is an apocalyptic number.

It is an amenable number.

1198986381 is a deficient number, since it is larger than the sum of its proper divisors (595468303).

1198986381 is an equidigital number, since it uses as much as digits as its factorization.

1198986381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27914 (or 27905 counting only the distinct ones).

The product of its digits is 746496, while the sum is 54.

The square root of 1198986381 is about 34626.3827305134. The cubic root of 1198986381 is about 1062.3592818669.

The spelling of 1198986381 in words is "one billion, one hundred ninety-eight million, nine hundred eighty-six thousand, three hundred eighty-one".