11943820 has 24 divisors (see below), whose sum is σ = 28665504. Its totient is φ = 4094976.

The previous prime is 11943817. The next prime is 11943821. The reversal of 11943820 is 2834911.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (11943821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42517 + ... + 42796.

It is an arithmetic number, because the mean of its divisors is an integer number (1194396).

Almost surely, 2^11943820 is an apocalyptic number.

11943820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11943820 is an abundant number, since it is smaller than the sum of its proper divisors (16721684).

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

11943820 is a wasteful number, since it uses less digits than its factorization.

11943820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85329 (or 85327 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 11943820 is about 3455.9832175518. The cubic root of 11943820 is about 228.5850114696.

The spelling of 11943820 in words is "eleven million, nine hundred forty-three thousand, eight hundred twenty".