123640437 has 16 divisors (see below), whose sum is σ = 169072640. Its totient is φ = 80326512.

The previous prime is 123640423. The next prime is 123640441. The reversal of 123640437 is 734046321.

It is not a de Polignac number, because 123640437 - 2¹⁰ = 123639413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123640457) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 77514 + ... + 79092.

It is an arithmetic number, because the mean of its divisors is an integer number (10567040).

Almost surely, 2^123640437 is an apocalyptic number.

It is an amenable number.

123640437 is a deficient number, since it is larger than the sum of its proper divisors (45432203).

123640437 is a wasteful number, since it uses less digits than its factorization.

123640437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232.

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 123640437 is about 11119.3721495415. The cubic root of 123640437 is about 498.1806372010.

Adding to 123640437 its reverse (734046321), we get a palindrome (857686758).

The spelling of 123640437 in words is "one hundred twenty-three million, six hundred forty thousand, four hundred thirty-seven".