123740655 has 16 divisors (see below), whose sum is σ = 199947744. Its totient is φ = 65340800.

The previous prime is 123740653. The next prime is 123740663. The reversal of 123740655 is 556047321.

It is not a de Polignac number, because 123740655 - 2¹ = 123740653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123740653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39324 + ... + 42353.

It is an arithmetic number, because the mean of its divisors is an integer number (12496734).

Almost surely, 2^123740655 is an apocalyptic number.

123740655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123740655 is a deficient number, since it is larger than the sum of its proper divisors (76207089).

123740655 is a wasteful number, since it uses less digits than its factorization.

123740655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81786.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 123740655 is about 11123.8776961993. The cubic root of 123740655 is about 498.3152026254.

Adding to 123740655 its reverse (556047321), we get a palindrome (679787976).

The spelling of 123740655 in words is "one hundred twenty-three million, seven hundred forty thousand, six hundred fifty-five".