123961643 has 16 divisors (see below), whose sum is σ = 141943200. Its totient is φ = 107308800.

The previous prime is 123961639. The next prime is 123961661. The reversal of 123961643 is 346169321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 123961643 - 2² = 123961639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123961613) 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, 22463 + ... + 27431.

It is an arithmetic number, because the mean of its divisors is an integer number (8871450).

Almost surely, 2^123961643 is an apocalyptic number.

123961643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

123961643 is a deficient number, since it is larger than the sum of its proper divisors (17981557).

123961643 is a wasteful number, since it uses less digits than its factorization.

123961643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102.

The product of its digits is 23328, while the sum is 35.

The square root of 123961643 is about 11133.8063123085. The cubic root of 123961643 is about 498.6116726623.

The spelling of 123961643 in words is "one hundred twenty-three million, nine hundred sixty-one thousand, six hundred forty-three".