1866221418 has 16 divisors (see below), whose sum is σ = 3732878016. Its totient is φ = 622001280.

The previous prime is 1866221407. The next prime is 1866221431. The reversal of 1866221418 is 8141226681.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72355 + ... + 94697.

It is an arithmetic number, because the mean of its divisors is an integer number (233304876).

Almost surely, 2^1866221418 is an apocalyptic number.

1866221418 is an abundant number, since it is smaller than the sum of its proper divisors (1866656598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1866221418 is a wasteful number, since it uses less digits than its factorization.

1866221418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36269.

The product of its digits is 36864, while the sum is 39.

The square root of 1866221418 is about 43199.7849300202. The cubic root of 1866221418 is about 1231.1785953317.

The spelling of 1866221418 in words is "one billion, eight hundred sixty-six million, two hundred twenty-one thousand, four hundred eighteen".