1440420400 has 60 divisors (see below), whose sum is σ = 3642766600. Its totient is φ = 545840640.

The previous prime is 1440420341. The next prime is 1440420403. The reversal of 1440420400 is 40240441.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (1440420403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87165 + ... + 102364.

Almost surely, 2^1440420400 is an apocalyptic number.

1440420400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1440420400 is an abundant number, since it is smaller than the sum of its proper divisors (2202346200).

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

1440420400 is a wasteful number, since it uses less digits than its factorization.

1440420400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189566 (or 189555 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 1440420400 is about 37952.8707741588. The cubic root of 1440420400 is about 1129.3531160611.

Adding to 1440420400 its reverse (40240441), we get a palindrome (1480660841).

The spelling of 1440420400 in words is "one billion, four hundred forty million, four hundred twenty thousand, four hundred".