206434423 has 4 divisors (see below), whose sum is σ = 222314008. Its totient is φ = 190554840.

The previous prime is 206434421. The next prime is 206434427. The reversal of 206434423 is 324434602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324434602 = 2 ⋅162217301.

It is a cyclic number.

It is not a de Polignac number, because 206434423 - 2¹ = 206434421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206434391 and 206434400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206434421) 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, 7939773 + ... + 7939798.

It is an arithmetic number, because the mean of its divisors is an integer number (55578502).

Almost surely, 2^206434423 is an apocalyptic number.

206434423 is a deficient number, since it is larger than the sum of its proper divisors (15879585).

206434423 is a wasteful number, since it uses less digits than its factorization.

206434423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15879584.

The product of its (nonzero) digits is 13824, while the sum is 28.

The square root of 206434423 is about 14367.8259663736. The cubic root of 206434423 is about 591.0089248664.

The spelling of 206434423 in words is "two hundred six million, four hundred thirty-four thousand, four hundred twenty-three".