1198501540 has 72 divisors (see below), whose sum is σ = 2626477056. Its totient is φ = 459345600.

The previous prime is 1198501523. The next prime is 1198501559. The reversal of 1198501540 is 451058911.

It is a junction number, because it is equal to n+sod(n) for n = 1198501496 and 1198501505.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2440695 + ... + 2441185.

It is an arithmetic number, because the mean of its divisors is an integer number (36478848).

Almost surely, 2^1198501540 is an apocalyptic number.

1198501540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1198501540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1313238528).

1198501540 is an abundant number, since it is smaller than the sum of its proper divisors (1427975516).

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

1198501540 is a wasteful number, since it uses less digits than its factorization.

1198501540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 34.

The square root of 1198501540 is about 34619.3809881113. The cubic root of 1198501540 is about 1062.2160651220.

The spelling of 1198501540 in words is "one billion, one hundred ninety-eight million, five hundred one thousand, five hundred forty".