123581808 has 80 divisors (see below), whose sum is σ = 405410560. Its totient is φ = 35308224.

The previous prime is 123581797. The next prime is 123581839. The reversal of 123581808 is 808185321.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17410 + ... + 23457.

It is an arithmetic number, because the mean of its divisors is an integer number (5067632).

Almost surely, 2^123581808 is an apocalyptic number.

123581808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

123581808 is an abundant number, since it is smaller than the sum of its proper divisors (281828752).

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

123581808 is a wasteful number, since it uses less digits than its factorization.

123581808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40891 (or 40879 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 123581808 is about 11116.7354920408. The cubic root of 123581808 is about 498.1018807381.

The spelling of 123581808 in words is "one hundred twenty-three million, five hundred eighty-one thousand, eight hundred eight".