201944690 has 16 divisors (see below), whose sum is σ = 376035480. Its totient is φ = 77992320.

The previous prime is 201944671. The next prime is 201944693. The reversal of 201944690 is 96449102.

It can be written as a sum of positive squares in 4 ways, for example, as 189420169 + 12524521 = 13763^2 + 3539^2 .

It is a super-2 number, since 2×201944690² = 81563315638392200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 201944690.

It is not an unprimeable number, because it can be changed into a prime (201944693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347891 + ... + 348470.

Almost surely, 2^201944690 is an apocalyptic number.

201944690 is a deficient number, since it is larger than the sum of its proper divisors (174090790).

201944690 is a wasteful number, since it uses less digits than its factorization.

201944690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696397.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 201944690 is about 14210.7244713280. The cubic root of 201944690 is about 586.6928732411.

The spelling of 201944690 in words is "two hundred one million, nine hundred forty-four thousand, six hundred ninety".