123720884 has 18 divisors (see below), whose sum is σ = 251860770. Its totient is φ = 53023152.

The previous prime is 123720869. The next prime is 123720893. The reversal of 123720884 is 488027321.

It can be written as a sum of positive squares in only one way, i.e., 87984400 + 35736484 = 9380^2 + 5978^2 .

It is a super-3 number, since 3×123720884³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 315419 + ... + 315810.

It is an arithmetic number, because the mean of its divisors is an integer number (13992265).

Almost surely, 2^123720884 is an apocalyptic number.

123720884 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

123720884 is an abundant number, since it is smaller than the sum of its proper divisors (128139886).

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

123720884 is a wasteful number, since it uses less digits than its factorization.

123720884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631247 (or 631238 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 123720884 is about 11122.9889867787. The cubic root of 123720884 is about 498.2886613225.

The spelling of 123720884 in words is "one hundred twenty-three million, seven hundred twenty thousand, eight hundred eighty-four".