123947515 has 4 divisors (see below), whose sum is σ = 148737024. Its totient is φ = 99158008.

The previous prime is 123947513. The next prime is 123947531. The reversal of 123947515 is 515749321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515749321 = 1283 ⋅401987.

It is a cyclic number.

It is not a de Polignac number, because 123947515 - 2¹ = 123947513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123947513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12394747 + ... + 12394756.

It is an arithmetic number, because the mean of its divisors is an integer number (37184256).

Almost surely, 2^123947515 is an apocalyptic number.

123947515 is a deficient number, since it is larger than the sum of its proper divisors (24789509).

123947515 is an equidigital number, since it uses as much as digits as its factorization.

123947515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24789508.

The product of its digits is 37800, while the sum is 37.

The square root of 123947515 is about 11133.1718301659. The cubic root of 123947515 is about 498.5927295625.

The spelling of 123947515 in words is "one hundred twenty-three million, nine hundred forty-seven thousand, five hundred fifteen".