1440991919 has 2 divisors, whose sum is σ = 1440991920. Its totient is φ = 1440991918.

The previous prime is 1440991913. The next prime is 1440991957. The reversal of 1440991919 is 9191990441.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1440991919 - 2²⁰ = 1439943343 is a prime.

It is a super-2 number, since 2×1440991919² = 4152915421246605122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440991913) 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 as a sum of consecutive naturals, namely, 720495959 + 720495960.

It is an arithmetic number, because the mean of its divisors is an integer number (720495960).

Almost surely, 2^1440991919 is an apocalyptic number.

1440991919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440991919 is an equidigital number, since it uses as much as digits as its factorization.

1440991919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 1440991919 is about 37960.3993524831. The cubic root of 1440991919 is about 1129.5024616774.

The spelling of 1440991919 in words is "one billion, four hundred forty million, nine hundred ninety-one thousand, nine hundred nineteen".