208440045 has 36 divisors (see below), whose sum is σ = 397137468. Its totient is φ = 101059200.

The previous prime is 208440031. The next prime is 208440059. The reversal of 208440045 is 540044802.

It is an interprime number because it is at equal distance from previous prime (208440031) and next prime (208440059).

It can be written as a sum of positive squares in 2 ways, for example, as 152324964 + 56115081 = 12342^2 + 7491^2 .

It is not a de Polignac number, because 208440045 - 2²¹ = 206342893 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13696 + ... + 24585.

Almost surely, 2^208440045 is an apocalyptic number.

It is an amenable number.

208440045 is a deficient number, since it is larger than the sum of its proper divisors (188697423).

208440045 is a wasteful number, since it uses less digits than its factorization.

208440045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38314 (or 38300 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 208440045 is about 14437.4528570659. The cubic root of 208440045 is about 592.9167500084.

Adding to 208440045 its reverse (540044802), we get a palindrome (748484847).

The spelling of 208440045 in words is "two hundred eight million, four hundred forty thousand, forty-five".