1866844480 has 28 divisors (see below), whose sum is σ = 4445424180. Its totient is φ = 746737664.

The previous prime is 1866844471. The next prime is 1866844489. The reversal of 1866844480 is 844486681.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1866844471) and next prime (1866844489).

It can be written as a sum of positive squares in 2 ways, for example, as 1266790464 + 600054016 = 35592^2 + 24496^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866844489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2916625 + ... + 2917264.

Almost surely, 2^1866844480 is an apocalyptic number.

1866844480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1866844480 is an abundant number, since it is smaller than the sum of its proper divisors (2578579700).

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

1866844480 is an equidigital number, since it uses as much as digits as its factorization.

1866844480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5833906 (or 5833896 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 49.

The square root of 1866844480 is about 43206.9957298584. The cubic root of 1866844480 is about 1231.3155950177.

The spelling of 1866844480 in words is "one billion, eight hundred sixty-six million, eight hundred forty-four thousand, four hundred eighty".