1440165221 has 8 divisors (see below), whose sum is σ = 1609409088. Its totient is φ = 1277308000.

The previous prime is 1440165197. The next prime is 1440165229. The reversal of 1440165221 is 1225610441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1440165221 - 2²² = 1435970917 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 (1440165229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1596185 + ... + 1597086.

It is an arithmetic number, because the mean of its divisors is an integer number (201176136).

Almost surely, 2^1440165221 is an apocalyptic number.

1440165221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1440165221 is a deficient number, since it is larger than the sum of its proper divisors (169243867).

1440165221 is a wasteful number, since it uses less digits than its factorization.

1440165221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3193323.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1440165221 is about 37949.5088374013. The cubic root of 1440165221 is about 1129.2864215927.

Adding to 1440165221 its reverse (1225610441), we get a palindrome (2665775662).

It can be divided in two parts, 1440 and 165221, that added together give a palindrome (166661).

The spelling of 1440165221 in words is "one billion, four hundred forty million, one hundred sixty-five thousand, two hundred twenty-one".