1440247221 has 48 divisors (see below), whose sum is σ = 2446778880. Its totient is φ = 799223040.

The previous prime is 1440247219. The next prime is 1440247231. The reversal of 1440247221 is 1227420441.

It is not a de Polignac number, because 1440247221 - 2¹ = 1440247219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440247231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 616171 + ... + 618503.

It is an arithmetic number, because the mean of its divisors is an integer number (50974560).

Almost surely, 2^1440247221 is an apocalyptic number.

It is an amenable number.

1440247221 is a deficient number, since it is larger than the sum of its proper divisors (1006531659).

1440247221 is a wasteful number, since it uses less digits than its factorization.

1440247221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626 (or 2623 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 1440247221 is about 37950.5892049122. The cubic root of 1440247221 is about 1129.3078542561.

Adding to 1440247221 its reverse (1227420441), we get a palindrome (2667667662).

The spelling of 1440247221 in words is "one billion, four hundred forty million, two hundred forty-seven thousand, two hundred twenty-one".