11897433984 has 128 divisors (see below), whose sum is σ = 33329030400. Its totient is φ = 3749953536.

The previous prime is 11897433967. The next prime is 11897433991. The reversal of 11897433984 is 48933479811.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×11897433984² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4908997 + ... + 4911419.

It is an arithmetic number, because the mean of its divisors is an integer number (260383050).

Almost surely, 2^11897433984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11897433984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16664515200).

11897433984 is an abundant number, since it is smaller than the sum of its proper divisors (21431596416).

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

11897433984 is a wasteful number, since it uses less digits than its factorization.

11897433984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132 (or 3120 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 57.

The spelling of 11897433984 in words is "eleven billion, eight hundred ninety-seven million, four hundred thirty-three thousand, nine hundred eighty-four".