11897856 has 66 divisors (see below), whose sum is σ = 34381412. Its totient is φ = 3962880.

The previous prime is 11897849. The next prime is 11897861. The reversal of 11897856 is 65879811.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8571 + ... + 9861.

Almost surely, 2^11897856 is an apocalyptic number.

11897856 is a gapful number since it is divisible by the number (16) 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 11897856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17190706).

11897856 is an abundant number, since it is smaller than the sum of its proper divisors (22483556).

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

11897856 is a wasteful number, since it uses less digits than its factorization.

11897856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317 (or 1296 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 11897856 is about 3449.3268908586. The cubic root of 11897856 is about 228.2914094742.

It can be divided in two parts, 1189 and 7856, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 11897856 in words is "eleven million, eight hundred ninety-seven thousand, eight hundred fifty-six".