63897209 has 4 divisors (see below), whose sum is σ = 67260240. Its totient is φ = 60534180.

The previous prime is 63897199. The next prime is 63897259. The reversal of 63897209 is 90279836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63897209 - 2¹⁶ = 63831673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 63897209.

It is not an unprimeable number, because it can be changed into a prime (63897259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1681487 + ... + 1681524.

It is an arithmetic number, because the mean of its divisors is an integer number (16815060).

Almost surely, 2^63897209 is an apocalyptic number.

It is an amenable number.

63897209 is a deficient number, since it is larger than the sum of its proper divisors (3363031).

63897209 is a wasteful number, since it uses less digits than its factorization.

63897209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3363030.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 63897209 is about 7993.5729808390. The cubic root of 63897209 is about 399.7857373326.

The spelling of 63897209 in words is "sixty-three million, eight hundred ninety-seven thousand, two hundred nine".