208390945 has 16 divisors (see below), whose sum is σ = 290481408. Its totient is φ = 140552640.

The previous prime is 208390927. The next prime is 208390951. The reversal of 208390945 is 549093802.

It is a happy number.

208390945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 208390945 - 2¹¹ = 208388897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 208390898 and 208390907.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46669 + ... + 50938.

It is an arithmetic number, because the mean of its divisors is an integer number (18155088).

Almost surely, 2^208390945 is an apocalyptic number.

It is an amenable number.

208390945 is a deficient number, since it is larger than the sum of its proper divisors (82090463).

208390945 is an equidigital number, since it uses as much as digits as its factorization.

208390945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97680.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 208390945 is about 14435.7523184627. The cubic root of 208390945 is about 592.8701906591.

The spelling of 208390945 in words is "two hundred eight million, three hundred ninety thousand, nine hundred forty-five".