440439991 has 6 divisors (see below), whose sum is σ = 442264976. Its totient is φ = 438622500.

The previous prime is 440439983. The next prime is 440439997. The reversal of 440439991 is 199934044.

It is a happy number.

It is not a de Polignac number, because 440439991 - 2³ = 440439983 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 (440439997) 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 5 ways as a sum of consecutive naturals, for example, 59506 + ... + 66496.

Almost surely, 2^440439991 is an apocalyptic number.

440439991 is a deficient number, since it is larger than the sum of its proper divisors (1824985).

440439991 is an frugal number, since it uses more digits than its factorization.

440439991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7493 (or 7242 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 440439991 is about 20986.6622167509. The cubic root of 440439991 is about 760.8439326708.

The spelling of 440439991 in words is "four hundred forty million, four hundred thirty-nine thousand, nine hundred ninety-one".