208440019 has 8 divisors (see below), whose sum is σ = 209933568. Its totient is φ = 206951040.

The previous prime is 208440017. The next prime is 208440031. The reversal of 208440019 is 910044802.

208440019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 208440019 - 2¹ = 208440017 is a prime.

It is a super-2 number, since 2×208440019² = 86894483041440722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208440017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186049 + ... + 187165.

It is an arithmetic number, because the mean of its divisors is an integer number (26241696).

Almost surely, 2^208440019 is an apocalyptic number.

208440019 is a deficient number, since it is larger than the sum of its proper divisors (1493549).

208440019 is a wasteful number, since it uses less digits than its factorization.

208440019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 208440019 is about 14437.4519566300. The cubic root of 208440019 is about 592.9167253557.

The spelling of 208440019 in words is "two hundred eight million, four hundred forty thousand, nineteen".