1440213455 has 4 divisors (see below), whose sum is σ = 1728256152. Its totient is φ = 1152170760.

The previous prime is 1440213451. The next prime is 1440213553. The reversal of 1440213455 is 5543120441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5543120441 = 491 ⋅11289451.

It is not a de Polignac number, because 1440213455 - 2² = 1440213451 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 (1440213451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144021341 + ... + 144021350.

It is an arithmetic number, because the mean of its divisors is an integer number (432064038).

Almost surely, 2^1440213455 is an apocalyptic number.

1440213455 is a deficient number, since it is larger than the sum of its proper divisors (288042697).

1440213455 is an equidigital number, since it uses as much as digits as its factorization.

1440213455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288042696.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 1440213455 is about 37950.1443343764. The cubic root of 1440213455 is about 1129.2990288020.

Adding to 1440213455 its reverse (5543120441), we get a palindrome (6983333896).

The spelling of 1440213455 in words is "one billion, four hundred forty million, two hundred thirteen thousand, four hundred fifty-five".