1440154021 has 2 divisors, whose sum is σ = 1440154022. Its totient is φ = 1440154020.

The previous prime is 1440154019. The next prime is 1440154061. The reversal of 1440154021 is 1204510441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1008761121 + 431392900 = 31761^2 + 20770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440154021 - 2¹ = 1440154019 is a prime.

Together with 1440154019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1440153983 and 1440154001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440154061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720077010 + 720077011.

It is an arithmetic number, because the mean of its divisors is an integer number (720077011).

Almost surely, 2^1440154021 is an apocalyptic number.

It is an amenable number.

1440154021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440154021 is an equidigital number, since it uses as much as digits as its factorization.

1440154021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1440154021 is about 37949.3612726222. The cubic root of 1440154021 is about 1129.2834941414.

Adding to 1440154021 its reverse (1204510441), we get a palindrome (2644664462).

The spelling of 1440154021 in words is "one billion, four hundred forty million, one hundred fifty-four thousand, twenty-one".