1905660640 has 48 divisors (see below), whose sum is σ = 4848445728. Its totient is φ = 703627776.

The previous prime is 1905660623. The next prime is 1905660641. The reversal of 1905660640 is 460665091.

It is a self number, because there is not a number n which added to its sum of digits gives 1905660640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1905660641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456012 + ... + 460171.

It is an arithmetic number, because the mean of its divisors is an integer number (101009286).

Almost surely, 2^1905660640 is an apocalyptic number.

1905660640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1905660640 is an abundant number, since it is smaller than the sum of its proper divisors (2942785088).

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

1905660640 is a wasteful number, since it uses less digits than its factorization.

1905660640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916211 (or 916203 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1905660640 is about 43653.8731385887. The cubic root of 1905660640 is about 1239.7911198626.

The spelling of 1905660640 in words is "one billion, nine hundred five million, six hundred sixty thousand, six hundred forty".