206423459 has 20 divisors (see below), whose sum is σ = 237323280. Its totient is φ = 179205840.

The previous prime is 206423417. The next prime is 206423461. The reversal of 206423459 is 954324602.

206423459 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-206423459 is a prime.

It is a super-2 number, since 2×206423459² = 85221288851049362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206423159) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 336437 + ... + 337049.

It is an arithmetic number, because the mean of its divisors is an integer number (11866164).

Almost surely, 2^206423459 is an apocalyptic number.

206423459 is a deficient number, since it is larger than the sum of its proper divisors (30899821).

206423459 is an frugal number, since it uses more digits than its factorization.

206423459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 206423459 is about 14367.4444143696. Note that the first 4 decimals coincide. The cubic root of 206423459 is about 590.9984615976.

The spelling of 206423459 in words is "two hundred six million, four hundred twenty-three thousand, four hundred fifty-nine".