1903489640 has 64 divisors (see below), whose sum is σ = 4618857600. Its totient is φ = 701828352.

The previous prime is 1903489639. The next prime is 1903489649. The reversal of 1903489640 is 469843091.

It is a Cunningham number, because it is equal to 43629²-1.

It is a junction number, because it is equal to n+sod(n) for n = 1903489591 and 1903489600.

It is not an unprimeable number, because it can be changed into a prime (1903489649) 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, 434099 + ... + 438461.

It is an arithmetic number, because the mean of its divisors is an integer number (72169650).

Almost surely, 2^1903489640 is an apocalyptic number.

1903489640 is a gapful number since it is divisible by the number (10) 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 1903489640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2309428800).

1903489640 is an abundant number, since it is smaller than the sum of its proper divisors (2715367960).

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

1903489640 is a wasteful number, since it uses less digits than its factorization.

1903489640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5226 (or 5222 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1903489640 is about 43628.9999885397. Note that the first 4 decimals coincide. The cubic root of 1903489640 is about 1239.3201354647.

The spelling of 1903489640 in words is "one billion, nine hundred three million, four hundred eighty-nine thousand, six hundred forty".