1440123653 has 2 divisors, whose sum is σ = 1440123654. Its totient is φ = 1440123652.

The previous prime is 1440123623. The next prime is 1440123689. The reversal of 1440123653 is 3563210441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1416920164 + 23203489 = 37642^2 + 4817^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440123653 - 2²² = 1435929349 is a prime.

It is a super-2 number, since 2×1440123653² = 4147912271860128818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440123623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720061826 + 720061827.

It is an arithmetic number, because the mean of its divisors is an integer number (720061827).

Almost surely, 2^1440123653 is an apocalyptic number.

It is an amenable number.

1440123653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440123653 is an equidigital number, since it uses as much as digits as its factorization.

1440123653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1440123653 is about 37948.9611583769. The cubic root of 1440123653 is about 1129.2755564899.

The spelling of 1440123653 in words is "one billion, four hundred forty million, one hundred twenty-three thousand, six hundred fifty-three".