1868816412 has 18 divisors (see below), whose sum is σ = 4723952688. Its totient is φ = 622938792.

The previous prime is 1868816407. The next prime is 1868816413. The reversal of 1868816412 is 2146188681.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868816413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25955748 + ... + 25955819.

It is an arithmetic number, because the mean of its divisors is an integer number (262441816).

Almost surely, 2^1868816412 is an apocalyptic number.

1868816412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1868816412 is an abundant number, since it is smaller than the sum of its proper divisors (2855136276).

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

1868816412 is a wasteful number, since it uses less digits than its factorization.

1868816412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51911577 (or 51911572 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 1868816412 is about 43229.8092986772. The cubic root of 1868816412 is about 1231.7489852000.

The spelling of 1868816412 in words is "one billion, eight hundred sixty-eight million, eight hundred sixteen thousand, four hundred twelve".