11837820 has 24 divisors (see below), whose sum is σ = 33146064. Its totient is φ = 3156736.

The previous prime is 11837809. The next prime is 11837827. The reversal of 11837820 is 2873811.

It is a happy number.

11837820 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11837827) 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, 98589 + ... + 98708.

It is an arithmetic number, because the mean of its divisors is an integer number (1381086).

Almost surely, 2^11837820 is an apocalyptic number.

11837820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11837820 is an abundant number, since it is smaller than the sum of its proper divisors (21308244).

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

11837820 is a wasteful number, since it uses less digits than its factorization.

11837820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197309 (or 197307 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 11837820 is about 3440.6133174189. The cubic root of 11837820 is about 227.9067793731.

The spelling of 11837820 in words is "eleven million, eight hundred thirty-seven thousand, eight hundred twenty".