123621365 has 48 divisors (see below), whose sum is σ = 185861952. Its totient is φ = 78414336.

The previous prime is 123621349. The next prime is 123621383. The reversal of 123621365 is 563126321.

It is not a de Polignac number, because 123621365 - 2⁴ = 123621349 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 278834 + ... + 279276.

It is an arithmetic number, because the mean of its divisors is an integer number (3872124).

Almost surely, 2^123621365 is an apocalyptic number.

It is an amenable number.

123621365 is a deficient number, since it is larger than the sum of its proper divisors (62240587).

123621365 is a wasteful number, since it uses less digits than its factorization.

123621365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 539 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 123621365 is about 11118.5145140887. The cubic root of 123621365 is about 498.1550204747.

Adding to 123621365 its reverse (563126321), we get a palindrome (686747686).

The spelling of 123621365 in words is "one hundred twenty-three million, six hundred twenty-one thousand, three hundred sixty-five".