4003994549 has 2 divisors, whose sum is σ = 4003994550. Its totient is φ = 4003994548.

The previous prime is 4003994543. The next prime is 4003994597. The reversal of 4003994549 is 9454993004.

4003994549 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3693600625 + 310393924 = 60775^2 + 17618^2 .

It is a cyclic number.

It is not a de Polignac number, because 4003994549 - 2¹² = 4003990453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4003994543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2001997274 + 2001997275.

It is an arithmetic number, because the mean of its divisors is an integer number (2001997275).

Almost surely, 2^4003994549 is an apocalyptic number.

It is an amenable number.

4003994549 is a deficient number, since it is larger than the sum of its proper divisors (1).

4003994549 is an equidigital number, since it uses as much as digits as its factorization.

4003994549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 4003994549 is about 63277.1250058028. The cubic root of 4003994549 is about 1587.9292887753.

The spelling of 4003994549 in words is "four billion, three million, nine hundred ninety-four thousand, five hundred forty-nine".