1865473872 has 20 divisors (see below), whose sum is σ = 4819140960. Its totient is φ = 621824608.

The previous prime is 1865473871. The next prime is 1865473877. The reversal of 1865473872 is 2783745681.

It is a super-2 number, since 2×1865473872² = 6959985534229344768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1865473871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19431972 + ... + 19432067.

It is an arithmetic number, because the mean of its divisors is an integer number (240957048).

Almost surely, 2^1865473872 is an apocalyptic number.

1865473872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1865473872 is an abundant number, since it is smaller than the sum of its proper divisors (2953667088).

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

1865473872 is a wasteful number, since it uses less digits than its factorization.

1865473872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38864050 (or 38864044 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The square root of 1865473872 is about 43191.1318675489. The cubic root of 1865473872 is about 1231.0141836955.

Subtracting 1865473872 from its reverse (2783745681), we obtain a square (918271809 = 30303²).

The spelling of 1865473872 in words is "one billion, eight hundred sixty-five million, four hundred seventy-three thousand, eight hundred seventy-two".