1866271240 has 16 divisors (see below), whose sum is σ = 4199110380. Its totient is φ = 746508480.

The previous prime is 1866271229. The next prime is 1866271279. The reversal of 1866271240 is 421726681.

It can be written as a sum of positive squares in 2 ways, for example, as 1785738564 + 80532676 = 42258^2 + 8974^2 .

It is a super-2 number, since 2×1866271240² = 6965936682502275200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1866271240.

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, 23328351 + ... + 23328430.

Almost surely, 2^1866271240 is an apocalyptic number.

1866271240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1866271240 is an abundant number, since it is smaller than the sum of its proper divisors (2332839140).

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

1866271240 is a wasteful number, since it uses less digits than its factorization.

1866271240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46656792 (or 46656788 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 1866271240 is about 43200.3615725609. The cubic root of 1866271240 is about 1231.1895513797.

The spelling of 1866271240 in words is "one billion, eight hundred sixty-six million, two hundred seventy-one thousand, two hundred forty".