1198431890 has 8 divisors (see below), whose sum is σ = 2157177420. Its totient is φ = 479372752.

The previous prime is 1198431877. The next prime is 1198431907. The reversal of 1198431890 is 981348911.

It can be written as a sum of positive squares in 2 ways, for example, as 1170118849 + 28313041 = 34207^2 + 5321^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 59921585 + ... + 59921604.

Almost surely, 2^1198431890 is an apocalyptic number.

1198431890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1198431890 is a deficient number, since it is larger than the sum of its proper divisors (958745530).

1198431890 is a wasteful number, since it uses less digits than its factorization.

1198431890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119843196.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 1198431890 is about 34618.3750340769. The cubic root of 1198431890 is about 1062.1954880987.

The spelling of 1198431890 in words is "one billion, one hundred ninety-eight million, four hundred thirty-one thousand, eight hundred ninety".