123740217 has 24 divisors (see below), whose sum is σ = 195118560. Its totient is φ = 78148800.

The previous prime is 123740209. The next prime is 123740249. The reversal of 123740217 is 712047321.

It is a happy number.

It is not a de Polignac number, because 123740217 - 2³ = 123740209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (123740417) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8784 + ... + 18017.

It is an arithmetic number, because the mean of its divisors is an integer number (8129940).

Almost surely, 2^123740217 is an apocalyptic number.

It is an amenable number.

123740217 is a deficient number, since it is larger than the sum of its proper divisors (71378343).

123740217 is an equidigital number, since it uses as much as digits as its factorization.

123740217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26835 (or 26823 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 123740217 is about 11123.8580088025. The cubic root of 123740217 is about 498.3146146691.

Adding to 123740217 its reverse (712047321), we get a palindrome (835787538).

The spelling of 123740217 in words is "one hundred twenty-three million, seven hundred forty thousand, two hundred seventeen".