206409172 has 24 divisors (see below), whose sum is σ = 382924584. Its totient is φ = 97016832.

The previous prime is 206409157. The next prime is 206409173. The reversal of 206409172 is 271904602.

206409172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 59660176 + 146748996 = 7724^2 + 12114^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206409173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85648 + ... + 88024.

It is an arithmetic number, because the mean of its divisors is an integer number (15955191).

Almost surely, 2^206409172 is an apocalyptic number.

It is an amenable number.

206409172 is a deficient number, since it is larger than the sum of its proper divisors (176515412).

206409172 is a wasteful number, since it uses less digits than its factorization.

206409172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3675 (or 3673 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 206409172 is about 14366.9472053043. The cubic root of 206409172 is about 590.9848265358.

The spelling of 206409172 in words is "two hundred six million, four hundred nine thousand, one hundred seventy-two".