1905993612 has 48 divisors (see below), whose sum is σ = 4960327680. Its totient is φ = 632906064.

The previous prime is 1905993587. The next prime is 1905993613. The reversal of 1905993612 is 2163995091.

It is a happy number.

1905993612 is a `hidden beast` number, since 19 + 0 + 599 + 36 + 12 = 666.

1905993612 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1905993613) 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, 5148 + ... + 61955.

It is an arithmetic number, because the mean of its divisors is an integer number (103340160).

Almost surely, 2^1905993612 is an apocalyptic number.

1905993612 is a gapful number since it is divisible by the number (12) 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 1905993612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2480163840).

1905993612 is an abundant number, since it is smaller than the sum of its proper divisors (3054334068).

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

1905993612 is a wasteful number, since it uses less digits than its factorization.

1905993612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67379 (or 67371 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 1905993612 is about 43657.6867458641. The cubic root of 1905993612 is about 1239.8633243392.

The spelling of 1905993612 in words is "one billion, nine hundred five million, nine hundred ninety-three thousand, six hundred twelve".