1440220440 has 64 divisors (see below), whose sum is σ = 4508524800. Its totient is φ = 367359872.

The previous prime is 1440220429. The next prime is 1440220447. The reversal of 1440220440 is 440220441.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440220447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258150 + ... + 263669.

It is an arithmetic number, because the mean of its divisors is an integer number (70445700).

Almost surely, 2^1440220440 is an apocalyptic number.

1440220440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1440220440 is an abundant number, since it is smaller than the sum of its proper divisors (3068304360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1440220440 is a wasteful number, since it uses less digits than its factorization.

1440220440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521856 (or 521852 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 1440220440 is about 37950.2363629003. The cubic root of 1440220440 is about 1129.3008544900.

Adding to 1440220440 its reverse (440220441), we get a palindrome (1880440881).

Subtracting from 1440220440 its reverse (440220441), we obtain a palindrome (999999999).

The spelling of 1440220440 in words is "one billion, four hundred forty million, two hundred twenty thousand, four hundred forty".