206188390 has 16 divisors (see below), whose sum is σ = 371654640. Its totient is φ = 82360800.

The previous prime is 206188373. The next prime is 206188429. The reversal of 206188390 is 93881602.

206188390 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6561 + ... + 21340.

It is an arithmetic number, because the mean of its divisors is an integer number (23228415).

Almost surely, 2^206188390 is an apocalyptic number.

206188390 is a deficient number, since it is larger than the sum of its proper divisors (165466250).

206188390 is a wasteful number, since it uses less digits than its factorization.

206188390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28647.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 206188390 is about 14359.2614712596. The cubic root of 206188390 is about 590.7740391310.

The spelling of 206188390 in words is "two hundred six million, one hundred eighty-eight thousand, three hundred ninety".