123438169 has 4 divisors (see below), whose sum is σ = 123462144. Its totient is φ = 123414196.

The previous prime is 123438163. The next prime is 123438191. The reversal of 123438169 is 961834321.

123438169 = T₉₀₇₀ + T₉₀₇₁ + T₉₀₇₂.

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.

It is a cyclic number.

It is not a de Polignac number, because 123438169 - 2⁵ = 123438137 is a prime.

It is a super-2 number, since 2×123438169² = 30473963132145122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123438163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757 + ... + 15730.

It is an arithmetic number, because the mean of its divisors is an integer number (30865536).

Almost surely, 2^123438169 is an apocalyptic number.

123438169 is the 9072-nd centered triangular number.

It is an amenable number.

123438169 is a deficient number, since it is larger than the sum of its proper divisors (23975).

123438169 is an equidigital number, since it uses as much as digits as its factorization.

123438169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23974.

The product of its digits is 31104, while the sum is 37.

The square root of 123438169 is about 11110.2731289559. The cubic root of 123438169 is about 497.9088248325.

The spelling of 123438169 in words is "one hundred twenty-three million, four hundred thirty-eight thousand, one hundred sixty-nine".