1866986480 has 80 divisors (see below), whose sum is σ = 4441215744. Its totient is φ = 729630720.

The previous prime is 1866986477. The next prime is 1866986483. The reversal of 1866986480 is 846896681.

It is an interprime number because it is at equal distance from previous prime (1866986477) and next prime (1866986483).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866986483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1190657 + ... + 1192223.

Almost surely, 2^1866986480 is an apocalyptic number.

1866986480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866986480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2220607872).

1866986480 is an abundant number, since it is smaller than the sum of its proper divisors (2574229264).

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

1866986480 is a wasteful number, since it uses less digits than its factorization.

1866986480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914 (or 1908 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 56.

The square root of 1866986480 is about 43208.6389510246. The cubic root of 1866986480 is about 1231.3468138977.

The spelling of 1866986480 in words is "one billion, eight hundred sixty-six million, nine hundred eighty-six thousand, four hundred eighty".