206253638 has 4 divisors (see below), whose sum is σ = 309380460. Its totient is φ = 103126818.

The previous prime is 206253617. The next prime is 206253643. The reversal of 206253638 is 836352602.

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

It is a junction number, because it is equal to n+sod(n) for n = 206253598 and 206253607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51563408 + ... + 51563411.

It is an arithmetic number, because the mean of its divisors is an integer number (77345115).

Almost surely, 2^206253638 is an apocalyptic number.

206253638 is a deficient number, since it is larger than the sum of its proper divisors (103126822).

206253638 is a wasteful number, since it uses less digits than its factorization.

206253638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103126821.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 206253638 is about 14361.5332746890. The cubic root of 206253638 is about 590.8363490719.

The spelling of 206253638 in words is "two hundred six million, two hundred fifty-three thousand, six hundred thirty-eight".