206404019 has 16 divisors (see below), whose sum is σ = 217056000. Its totient is φ = 196077024.

The previous prime is 206403997. The next prime is 206404027. The reversal of 206404019 is 910404602.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206404019 is a prime.

It is a super-2 number, since 2×206404019² = 85205238118704722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206404039) 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, 344282 + ... + 344880.

It is an arithmetic number, because the mean of its divisors is an integer number (13566000).

Almost surely, 2^206404019 is an apocalyptic number.

206404019 is a deficient number, since it is larger than the sum of its proper divisors (10651981).

206404019 is a wasteful number, since it uses less digits than its factorization.

206404019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 206404019 is about 14366.7678689398. The cubic root of 206404019 is about 590.9799085209.

The spelling of 206404019 in words is "two hundred six million, four hundred four thousand, nineteen".