1198139955 has 16 divisors (see below), whose sum is σ = 1923951264. Its totient is φ = 636698880.

The previous prime is 1198139953. The next prime is 1198139977. The reversal of 1198139955 is 5599318911.

It is not a de Polignac number, because 1198139955 - 2¹ = 1198139953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1198139898 and 1198139907.

It is not an unprimeable number, because it can be changed into a prime (1198139953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140026 + ... + 148335.

It is an arithmetic number, because the mean of its divisors is an integer number (120246954).

Almost surely, 2^1198139955 is an apocalyptic number.

1198139955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1198139955 is a deficient number, since it is larger than the sum of its proper divisors (725811309).

1198139955 is a wasteful number, since it uses less digits than its factorization.

1198139955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288646.

The product of its digits is 437400, while the sum is 51.

The square root of 1198139955 is about 34614.1583026368. The cubic root of 1198139955 is about 1062.1092317096.

The spelling of 1198139955 in words is "one billion, one hundred ninety-eight million, one hundred thirty-nine thousand, nine hundred fifty-five".