11929820 has 24 divisors (see below), whose sum is σ = 28631904. Its totient is φ = 4090176.

The previous prime is 11929793. The next prime is 11929837. The reversal of 11929820 is 2892911.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42467 + ... + 42746.

It is an arithmetic number, because the mean of its divisors is an integer number (1192996).

Almost surely, 2^11929820 is an apocalyptic number.

11929820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11929820 is an abundant number, since it is smaller than the sum of its proper divisors (16702084).

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

11929820 is a wasteful number, since it uses less digits than its factorization.

11929820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85229 (or 85227 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 11929820 is about 3453.9571508633. The cubic root of 11929820 is about 228.4956642494.

The spelling of 11929820 in words is "eleven million, nine hundred twenty-nine thousand, eight hundred twenty".