11801816 has 32 divisors (see below), whose sum is σ = 24482640. Its totient is φ = 5298048.

The previous prime is 11801771. The next prime is 11801821. The reversal of 11801816 is 61810811.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2315 + ... + 5381.

Almost surely, 2^11801816 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 11801816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12241320).

11801816 is an abundant number, since it is smaller than the sum of its proper divisors (12680824).

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

11801816 is a wasteful number, since it uses less digits than its factorization.

11801816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123 (or 3119 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 26.

The square root of 11801816 is about 3435.3771263138. The cubic root of 11801816 is about 227.6754899221.

The spelling of 11801816 in words is "eleven million, eight hundred one thousand, eight hundred sixteen".