1440213531 has 32 divisors (see below), whose sum is σ = 2108602368. Its totient is φ = 870443520.

The previous prime is 1440213451. The next prime is 1440213553. The reversal of 1440213531 is 1353120441.

It is a happy number.

It is not a de Polignac number, because 1440213531 - 2¹⁷ = 1440082459 is a prime.

It is a super-2 number, since 2×1440213531² = 4148430029750975922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1440213031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 356881 + ... + 360893.

It is an arithmetic number, because the mean of its divisors is an integer number (65893824).

Almost surely, 2^1440213531 is an apocalyptic number.

1440213531 is a deficient number, since it is larger than the sum of its proper divisors (668388837).

1440213531 is a wasteful number, since it uses less digits than its factorization.

1440213531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1440213531 is about 37950.1453356901. The cubic root of 1440213531 is about 1129.2990486664.

Adding to 1440213531 its reverse (1353120441), we get a palindrome (2793333972).

The spelling of 1440213531 in words is "one billion, four hundred forty million, two hundred thirteen thousand, five hundred thirty-one".