1199158638 has 16 divisors (see below), whose sum is σ = 2417203200. Its totient is φ = 396571896.

The previous prime is 1199158633. The next prime is 1199158643. The reversal of 1199158638 is 8368519911.

It is an interprime number because it is at equal distance from previous prime (1199158633) and next prime (1199158643).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1199158633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 786088 + ... + 787611.

It is an arithmetic number, because the mean of its divisors is an integer number (151075200).

Almost surely, 2^1199158638 is an apocalyptic number.

1199158638 is an abundant number, since it is smaller than the sum of its proper divisors (1218044562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1199158638 is a wasteful number, since it uses less digits than its factorization.

1199158638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573831.

The product of its digits is 466560, while the sum is 51.

The square root of 1199158638 is about 34628.8700075529. The cubic root of 1199158638 is about 1062.4101554111.

The spelling of 1199158638 in words is "one billion, one hundred ninety-nine million, one hundred fifty-eight thousand, six hundred thirty-eight".