440978661 has 28 divisors (see below), whose sum is σ = 664194240. Its totient is φ = 292640040.

The previous prime is 440978653. The next prime is 440978683. The reversal of 440978661 is 166879044.

It is not a de Polignac number, because 440978661 - 2³ = 440978653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440978621) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 172966 + ... + 175496.

Almost surely, 2^440978661 is an apocalyptic number.

It is an amenable number.

440978661 is a deficient number, since it is larger than the sum of its proper divisors (223215579).

440978661 is an equidigital number, since it uses as much as digits as its factorization.

440978661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788 (or 2773 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 440978661 is about 20999.4919224252. The cubic root of 440978661 is about 761.1539838618.

The spelling of 440978661 in words is "four hundred forty million, nine hundred seventy-eight thousand, six hundred sixty-one".