123815955 has 8 divisors (see below), whose sum is σ = 198105552. Its totient is φ = 66035168.

The previous prime is 123815903. The next prime is 123815987. The reversal of 123815955 is 559518321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123815955 - 2¹⁸ = 123553811 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4127184 + ... + 4127213.

It is an arithmetic number, because the mean of its divisors is an integer number (24763194).

Almost surely, 2^123815955 is an apocalyptic number.

123815955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123815955 is a deficient number, since it is larger than the sum of its proper divisors (74289597).

123815955 is an equidigital number, since it uses as much as digits as its factorization.

123815955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8254405.

The product of its digits is 54000, while the sum is 39.

The square root of 123815955 is about 11127.2617925526. The cubic root of 123815955 is about 498.4162621789.

It can be divided in two parts, 12381 and 5955, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 123815955 in words is "one hundred twenty-three million, eight hundred fifteen thousand, nine hundred fifty-five".