63440399 has 16 divisors (see below), whose sum is σ = 70848000. Its totient is φ = 56320320.

The previous prime is 63440389. The next prime is 63440401. The reversal of 63440399 is 99304436.

It is a cyclic number.

It is not a de Polignac number, because 63440399 - 2¹⁶ = 63374863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63440339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154907 + ... + 155315.

It is an arithmetic number, because the mean of its divisors is an integer number (4428000).

Almost surely, 2^63440399 is an apocalyptic number.

63440399 is a deficient number, since it is larger than the sum of its proper divisors (7407601).

63440399 is a wasteful number, since it uses less digits than its factorization.

63440399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718.

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 63440399 is about 7964.9481479794. The cubic root of 63440399 is about 398.8307500500.

The spelling of 63440399 in words is "sixty-three million, four hundred forty thousand, three hundred ninety-nine".