206397019 has 4 divisors (see below), whose sum is σ = 217260040. Its totient is φ = 195534000.

The previous prime is 206397007. The next prime is 206397041. The reversal of 206397019 is 910793602.

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

It is a cyclic number.

It is not a de Polignac number, because 206397019 - 2⁵ = 206396987 is a prime.

It is a super-2 number, since 2×206397019² = 85199458904172722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206397419) 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, 5431482 + ... + 5431519.

It is an arithmetic number, because the mean of its divisors is an integer number (54315010).

Almost surely, 2^206397019 is an apocalyptic number.

206397019 is a deficient number, since it is larger than the sum of its proper divisors (10863021).

206397019 is a wasteful number, since it uses less digits than its factorization.

206397019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10863020.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 206397019 is about 14366.5242491008. The cubic root of 206397019 is about 590.9732276011.

The spelling of 206397019 in words is "two hundred six million, three hundred ninety-seven thousand, nineteen".