1878320217 has 16 divisors (see below), whose sum is σ = 2514253760. Its totient is φ = 1247311872.

The previous prime is 1878320201. The next prime is 1878320263. The reversal of 1878320217 is 7120238781.

It is not a de Polignac number, because 1878320217 - 2⁴ = 1878320201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1878320117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1070613 + ... + 1072365.

It is an arithmetic number, because the mean of its divisors is an integer number (157140860).

Almost surely, 2^1878320217 is an apocalyptic number.

It is an amenable number.

1878320217 is a deficient number, since it is larger than the sum of its proper divisors (635933543).

1878320217 is a wasteful number, since it uses less digits than its factorization.

1878320217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 1878320217 is about 43339.5917954934. The cubic root of 1878320217 is about 1233.8334621196.

Adding to 1878320217 its reverse (7120238781), we get a palindrome (8998558998).

The spelling of 1878320217 in words is "one billion, eight hundred seventy-eight million, three hundred twenty thousand, two hundred seventeen".