123436 has 6 divisors (see below), whose sum is σ = 216020. Its totient is φ = 61716.

The previous prime is 123433. The next prime is 123439. The reversal of 123436 is 634321.

It is an interprime number because it is at equal distance from previous prime (123433) and next prime (123439).

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

It is not an unprimeable number, because it can be changed into a prime (123433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15426 + ... + 15433.

2¹²³⁴³⁶ is an apocalyptic number.

It is an amenable number.

123436 is a deficient number, since it is larger than the sum of its proper divisors (92584).

123436 is a wasteful number, since it uses less digits than its factorization.

123436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30863 (or 30861 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 123436 is about 351.3345983532. The cubic root of 123436 is about 49.7905908472.

Adding to 123436 its reverse (634321), we get a palindrome (757757).

It can be divided in two parts, 123 and 436, that multiplied together give a triangular number (53628 = T₃₂₇).

The spelling of 123436 in words is "one hundred twenty-three thousand, four hundred thirty-six".