200396789649 has 27 divisors (see below), whose sum is σ = 336736932987. Its totient is φ = 114507079344.

The previous prime is 200396789647. The next prime is 200396789669. The reversal of 200396789649 is 946987693002.

The square root of 200396789649 is 447657.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 200359188225 + 37601424 = 447615^2 + 6132^2 .

It is not a de Polignac number, because 200396789649 - 2¹ = 200396789647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (200396789641) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9390139 + ... + 9411455.

Almost surely, 2^200396789649 is an apocalyptic number.

200396789649 is the 447657-th square number.

200396789649 is the 223829-th centered octagonal number.

It is an amenable number.

200396789649 is a deficient number, since it is larger than the sum of its proper divisors (136340143338).

200396789649 is an frugal number, since it uses more digits than its factorization.

200396789649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42654 (or 21327 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 63.

The spelling of 200396789649 in words is "two hundred billion, three hundred ninety-six million, seven hundred eighty-nine thousand, six hundred forty-nine".