11990427540 has 96 divisors (see below), whose sum is σ = 41320876800. Its totient is φ = 2529847296.

The previous prime is 11990427523. The next prime is 11990427557. The reversal of 11990427540 is 4572409911.

It is an interprime number because it is at equal distance from previous prime (11990427523) and next prime (11990427557).

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

It is a junction number, because it is equal to n+sod(n) for n = 11990427492 and 11990427501.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1092565 + ... + 1103484.

It is an arithmetic number, because the mean of its divisors is an integer number (430425800).

Almost surely, 2^11990427540 is an apocalyptic number.

11990427540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11990427540 is an abundant number, since it is smaller than the sum of its proper divisors (29330449260).

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

11990427540 is a wasteful number, since it uses less digits than its factorization.

11990427540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196081 (or 2196079 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 11990427540 in words is "eleven billion, nine hundred ninety million, four hundred twenty-seven thousand, five hundred forty".