123237820 has 24 divisors (see below), whose sum is σ = 267724800. Its totient is φ = 47595072.

The previous prime is 123237809. The next prime is 123237823. The reversal of 123237820 is 28732321.

123237820 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

123237820 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123237823) 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, 105660 + ... + 106819.

It is an arithmetic number, because the mean of its divisors is an integer number (11155200).

Almost surely, 2^123237820 is an apocalyptic number.

123237820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123237820 is an abundant number, since it is smaller than the sum of its proper divisors (144486980).

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

123237820 is a wasteful number, since it uses less digits than its factorization.

123237820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212517 (or 212515 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 123237820 is about 11101.2530824227. The cubic root of 123237820 is about 497.6392983837.

The spelling of 123237820 in words is "one hundred twenty-three million, two hundred thirty-seven thousand, eight hundred twenty".