1903806540 has 72 divisors (see below), whose sum is σ = 6114588480. Its totient is φ = 477817344.

The previous prime is 1903806497. The next prime is 1903806559. The reversal of 1903806540 is 456083091.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1903806495 and 1903806504.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308020 + ... + 314139.

It is an arithmetic number, because the mean of its divisors is an integer number (84924840).

Almost surely, 2^1903806540 is an apocalyptic number.

1903806540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1903806540 is an abundant number, since it is smaller than the sum of its proper divisors (4210781940).

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

1903806540 is a wasteful number, since it uses less digits than its factorization.

1903806540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622191 (or 622186 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1903806540 is about 43632.6315960887. The cubic root of 1903806540 is about 1239.3889071826.

The spelling of 1903806540 in words is "one billion, nine hundred three million, eight hundred six thousand, five hundred forty".