123655399 has 16 divisors (see below), whose sum is σ = 150486336. Its totient is φ = 99187200.

The previous prime is 123655397. The next prime is 123655417. The reversal of 123655399 is 993556321.

It is not a de Polignac number, because 123655399 - 2¹ = 123655397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123655397) 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, 18669 + ... + 24409.

It is an arithmetic number, because the mean of its divisors is an integer number (9405396).

Almost surely, 2^123655399 is an apocalyptic number.

123655399 is a deficient number, since it is larger than the sum of its proper divisors (26830937).

123655399 is a wasteful number, since it uses less digits than its factorization.

123655399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5946.

The product of its digits is 218700, while the sum is 43.

The square root of 123655399 is about 11120.0449189740. The cubic root of 123655399 is about 498.2007317004.

The spelling of 123655399 in words is "one hundred twenty-three million, six hundred fifty-five thousand, three hundred ninety-nine".