123640415 has 4 divisors (see below), whose sum is σ = 148368504. Its totient is φ = 98912328.

The previous prime is 123640411. The next prime is 123640423. The reversal of 123640415 is 514046321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123640415 - 2² = 123640411 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 (123640411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12364037 + ... + 12364046.

It is an arithmetic number, because the mean of its divisors is an integer number (37092126).

Almost surely, 2^123640415 is an apocalyptic number.

123640415 is a deficient number, since it is larger than the sum of its proper divisors (24728089).

123640415 is an equidigital number, since it uses as much as digits as its factorization.

123640415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24728088.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 123640415 is about 11119.3711602770. The cubic root of 123640415 is about 498.1806076530.

Adding to 123640415 its reverse (514046321), we get a palindrome (637686736).

The spelling of 123640415 in words is "one hundred twenty-three million, six hundred forty thousand, four hundred fifteen".