11990534840 has 16 divisors (see below), whose sum is σ = 26978703480. Its totient is φ = 4796213920.

The previous prime is 11990534813. The next prime is 11990534849. The reversal of 11990534840 is 4843509911.

It is a junction number, because it is equal to n+sod(n) for n = 11990534791 and 11990534800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11990534849) 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, 149881646 + ... + 149881725.

Almost surely, 2^11990534840 is an apocalyptic number.

11990534840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11990534840 is an abundant number, since it is smaller than the sum of its proper divisors (14988168640).

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

11990534840 is a wasteful number, since it uses less digits than its factorization.

11990534840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299763382 (or 299763378 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 11990534840 in words is "eleven billion, nine hundred ninety million, five hundred thirty-four thousand, eight hundred forty".