2003985649 has 2 divisors, whose sum is σ = 2003985650. Its totient is φ = 2003985648.

The previous prime is 2003985647. The next prime is 2003985667. The reversal of 2003985649 is 9465893002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1354755249 + 649230400 = 36807^2 + 25480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003985649 - 2¹ = 2003985647 is a prime.

Together with 2003985647, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2003985599 and 2003985608.

It is not a weakly prime, because it can be changed into another prime (2003985647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001992824 + 1001992825.

It is an arithmetic number, because the mean of its divisors is an integer number (1001992825).

Almost surely, 2^2003985649 is an apocalyptic number.

It is an amenable number.

2003985649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2003985649 is an equidigital number, since it uses as much as digits as its factorization.

2003985649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 2003985649 is about 44765.8982820629. The cubic root of 2003985649 is about 1260.7574284009.

The spelling of 2003985649 in words is "two billion, three million, nine hundred eighty-five thousand, six hundred forty-nine".