206243643 has 16 divisors (see below), whose sum is σ = 291837600. Its totient is φ = 129110016.

The previous prime is 206243633. The next prime is 206243647. The reversal of 206243643 is 346342602.

It is a happy number.

206243643 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-206243643 is a prime.

It is a super-2 number, since 2×206243643² = 85072880555822898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206243643.

It is not an unprimeable number, because it can be changed into a prime (206243647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18883 + ... + 27731.

It is an arithmetic number, because the mean of its divisors is an integer number (18239850).

Almost surely, 2^206243643 is an apocalyptic number.

206243643 is a deficient number, since it is larger than the sum of its proper divisors (85593957).

206243643 is a wasteful number, since it uses less digits than its factorization.

206243643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9326.

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 206243643 is about 14361.1852923079. The cubic root of 206243643 is about 590.8268049902.

The spelling of 206243643 in words is "two hundred six million, two hundred forty-three thousand, six hundred forty-three".