11998540 has 12 divisors (see below), whose sum is σ = 25196976. Its totient is φ = 4799408.

The previous prime is 11998529. The next prime is 11998541. The reversal of 11998540 is 4589911.

11998540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 11998540.

It is not an unprimeable number, because it can be changed into a prime (11998541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299944 + ... + 299983.

It is an arithmetic number, because the mean of its divisors is an integer number (2099748).

Almost surely, 2^11998540 is an apocalyptic number.

11998540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11998540 is an abundant number, since it is smaller than the sum of its proper divisors (13198436).

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

11998540 is a wasteful number, since it uses less digits than its factorization.

11998540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599936 (or 599934 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 11998540 is about 3463.8908758793. The cubic root of 11998540 is about 228.9335632297.

The spelling of 11998540 in words is "eleven million, nine hundred ninety-eight thousand, five hundred forty".