123404536 has 8 divisors (see below), whose sum is σ = 231383520. Its totient is φ = 61702264.

The previous prime is 123404497. The next prime is 123404537. The reversal of 123404536 is 635404321.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123404537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7712776 + ... + 7712791.

It is an arithmetic number, because the mean of its divisors is an integer number (28922940).

Almost surely, 2^123404536 is an apocalyptic number.

It is an amenable number.

123404536 is a deficient number, since it is larger than the sum of its proper divisors (107978984).

123404536 is a wasteful number, since it uses less digits than its factorization.

123404536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15425573 (or 15425569 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 123404536 is about 11108.7594266867. The cubic root of 123404536 is about 497.8635992517.

Adding to 123404536 its reverse (635404321), we get a palindrome (758808857).

The spelling of 123404536 in words is "one hundred twenty-three million, four hundred four thousand, five hundred thirty-six".