123945747 has 16 divisors (see below), whose sum is σ = 172495008. Its totient is φ = 79089920.

The previous prime is 123945743. The next prime is 123945803. The reversal of 123945747 is 747549321.

It is a cyclic number.

It is not a de Polignac number, because 123945747 - 2² = 123945743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123945699 and 123945708.

It is not an unprimeable number, because it can be changed into a prime (123945743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2988 + ... + 16025.

It is an arithmetic number, because the mean of its divisors is an integer number (10780938).

Almost surely, 2^123945747 is an apocalyptic number.

123945747 is a deficient number, since it is larger than the sum of its proper divisors (48549261).

123945747 is a wasteful number, since it uses less digits than its factorization.

123945747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19110.

The product of its digits is 211680, while the sum is 42.

The square root of 123945747 is about 11133.0924275333. The cubic root of 123945747 is about 498.5903588920.

The spelling of 123945747 in words is "one hundred twenty-three million, nine hundred forty-five thousand, seven hundred forty-seven".