1198728681 has 8 divisors (see below), whose sum is σ = 1599559680. Its totient is φ = 798525072.

The previous prime is 1198728679. The next prime is 1198728683. The reversal of 1198728681 is 1868278911.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1198728679) and next prime (1198728683).

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

It is not a de Polignac number, because 1198728681 - 2¹ = 1198728679 is a prime.

It is a super-2 number, since 2×1198728681² = 2873900901303999522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1198728683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152370 + ... + 160043.

It is an arithmetic number, because the mean of its divisors is an integer number (199944960).

Almost surely, 2^1198728681 is an apocalyptic number.

It is an amenable number.

1198728681 is a deficient number, since it is larger than the sum of its proper divisors (400830999).

1198728681 is a wasteful number, since it uses less digits than its factorization.

1198728681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313695.

The product of its digits is 387072, while the sum is 51.

The square root of 1198728681 is about 34622.6613795069. The cubic root of 1198728681 is about 1062.2831649047.

The spelling of 1198728681 in words is "one billion, one hundred ninety-eight million, seven hundred twenty-eight thousand, six hundred eighty-one".