1866782172 has 24 divisors (see below), whose sum is σ = 4612050576. Its totient is φ = 585657088.

The previous prime is 1866782119. The next prime is 1866782173. The reversal of 1866782172 is 2712876681.

It is a super-3 number, since 3×1866782172³ (a number of 29 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866782173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4575243 + ... + 4575650.

It is an arithmetic number, because the mean of its divisors is an integer number (192168774).

Almost surely, 2^1866782172 is an apocalyptic number.

1866782172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1866782172 is an abundant number, since it is smaller than the sum of its proper divisors (2745268404).

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

1866782172 is a wasteful number, since it uses less digits than its factorization.

1866782172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9150917 (or 9150915 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 1866782172 is about 43206.2746831985. The cubic root of 1866782172 is about 1231.3018960252.

The spelling of 1866782172 in words is "one billion, eight hundred sixty-six million, seven hundred eighty-two thousand, one hundred seventy-two".