1144640023 has 4 divisors (see below), whose sum is σ = 1151034840. Its totient is φ = 1138245208.

The previous prime is 1144639999. The next prime is 1144640027. The reversal of 1144640023 is 3200464411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3200464411 = 13499 ⋅237089.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1144640023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1144640023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144640027) 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, 3197140 + ... + 3197497.

It is an arithmetic number, because the mean of its divisors is an integer number (287758710).

Almost surely, 2^1144640023 is an apocalyptic number.

1144640023 is a deficient number, since it is larger than the sum of its proper divisors (6394817).

1144640023 is an equidigital number, since it uses as much as digits as its factorization.

1144640023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6394816.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1144640023 is about 33832.5290659744. The cubic root of 1144640023 is about 1046.0593099700.

The spelling of 1144640023 in words is "one billion, one hundred forty-four million, six hundred forty thousand, twenty-three".