206372947 has 4 divisors (see below), whose sum is σ = 225134136. Its totient is φ = 187611760.

The previous prime is 206372941. The next prime is 206372977. The reversal of 206372947 is 749273602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206372947 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206372941) 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, 9380578 + ... + 9380599.

It is an arithmetic number, because the mean of its divisors is an integer number (56283534).

Almost surely, 2^206372947 is an apocalyptic number.

206372947 is a deficient number, since it is larger than the sum of its proper divisors (18761189).

206372947 is a wasteful number, since it uses less digits than its factorization.

206372947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18761188.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 206372947 is about 14365.6864437450. The cubic root of 206372947 is about 590.9502517191.

The spelling of 206372947 in words is "two hundred six million, three hundred seventy-two thousand, nine hundred forty-seven".