123664429 has 4 divisors (see below), whose sum is σ = 141330784. Its totient is φ = 105998076.

The previous prime is 123664403. The next prime is 123664433. The reversal of 123664429 is 924466321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 924466321 = 29 ⋅31878149.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123664429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123664129) 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, 8833167 + ... + 8833180.

It is an arithmetic number, because the mean of its divisors is an integer number (35332696).

Almost surely, 2^123664429 is an apocalyptic number.

It is an amenable number.

123664429 is a deficient number, since it is larger than the sum of its proper divisors (17666355).

123664429 is an equidigital number, since it uses as much as digits as its factorization.

123664429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17666354.

The product of its digits is 62208, while the sum is 37.

The square root of 123664429 is about 11120.4509351015. The cubic root of 123664429 is about 498.2128585279.

The spelling of 123664429 in words is "one hundred twenty-three million, six hundred sixty-four thousand, four hundred twenty-nine".