123261387 has 4 divisors (see below), whose sum is σ = 164348520. Its totient is φ = 82174256.

The previous prime is 123261377. The next prime is 123261389. The reversal of 123261387 is 783162321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 783162321 = 3 ⋅261054107.

It is a cyclic number.

It is not a de Polignac number, because 123261387 - 2⁴ = 123261371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123261389) 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, 20543562 + ... + 20543567.

It is an arithmetic number, because the mean of its divisors is an integer number (41087130).

Almost surely, 2^123261387 is an apocalyptic number.

123261387 is a deficient number, since it is larger than the sum of its proper divisors (41087133).

123261387 is an equidigital number, since it uses as much as digits as its factorization.

123261387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41087132.

The product of its digits is 12096, while the sum is 33.

The square root of 123261387 is about 11102.3144884299. The cubic root of 123261387 is about 497.6710178614.

The spelling of 123261387 in words is "one hundred twenty-three million, two hundred sixty-one thousand, three hundred eighty-seven".