1390221218 has 8 divisors (see below), whose sum is σ = 2133828048. Its totient is φ = 678945204.

The previous prime is 1390221191. The next prime is 1390221247. The reversal of 1390221218 is 8121220931.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8082596 + ... + 8082767.

It is an arithmetic number, because the mean of its divisors is an integer number (266728506).

Almost surely, 2^1390221218 is an apocalyptic number.

1390221218 is a deficient number, since it is larger than the sum of its proper divisors (743606830).

1390221218 is a wasteful number, since it uses less digits than its factorization.

1390221218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16165408.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1390221218 is about 37285.6704110306. The cubic root of 1390221218 is about 1116.0782314561.

The spelling of 1390221218 in words is "one billion, three hundred ninety million, two hundred twenty-one thousand, two hundred eighteen".