206971394 has 12 divisors (see below), whose sum is σ = 361144134. Its totient is φ = 88701984.

The previous prime is 206971381. The next prime is 206971397. The reversal of 206971394 is 493179602.

It can be written as a sum of positive squares in only one way, i.e., 175218169 + 31753225 = 13237^2 + 5635^2 .

It is not an unprimeable number, because it can be changed into a prime (206971397) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1055879 + ... + 1056074.

Almost surely, 2^206971394 is an apocalyptic number.

206971394 is a deficient number, since it is larger than the sum of its proper divisors (154172740).

206971394 is a wasteful number, since it uses less digits than its factorization.

206971394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111969 (or 2111962 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 206971394 is about 14386.5004083690. The cubic root of 206971394 is about 591.5209193960.

The spelling of 206971394 in words is "two hundred six million, nine hundred seventy-one thousand, three hundred ninety-four".