11881830 has 16 divisors (see below), whose sum is σ = 28516464. Its totient is φ = 3168480.

The previous prime is 11881829. The next prime is 11881843. The reversal of 11881830 is 3818811.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 396061 = 11881830 / (1 + 1 + 8 + 8 + 1 + 8 + 3 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198001 + ... + 198060.

It is an arithmetic number, because the mean of its divisors is an integer number (1782279).

Almost surely, 2^11881830 is an apocalyptic number.

11881830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11881830 is an abundant number, since it is smaller than the sum of its proper divisors (16634634).

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

11881830 is a wasteful number, since it uses less digits than its factorization.

11881830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396071.

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 11881830 is about 3447.0030461257. The cubic root of 11881830 is about 228.1888632108.

The spelling of 11881830 in words is "eleven million, eight hundred eighty-one thousand, eight hundred thirty".