1198135554 has 384 divisors, whose sum is σ = 3593134080. Its totient is φ = 261273600.

The previous prime is 1198135553. The next prime is 1198135577. The reversal of 1198135554 is 4555318911.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1198135553) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 32382024 + ... + 32382060.

It is an arithmetic number, because the mean of its divisors is an integer number (9357120).

Almost surely, 2^1198135554 is an apocalyptic number.

1198135554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1198135554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1796567040).

1198135554 is an abundant number, since it is smaller than the sum of its proper divisors (2394998526).

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

1198135554 is a wasteful number, since it uses less digits than its factorization.

1198135554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 127 counting only the distinct ones).

The product of its digits is 108000, while the sum is 42.

The square root of 1198135554 is about 34614.0947303263. The cubic root of 1198135554 is about 1062.1079312637.

The spelling of 1198135554 in words is "one billion, one hundred ninety-eight million, one hundred thirty-five thousand, five hundred fifty-four".