1440243157 has 2 divisors, whose sum is σ = 1440243158. Its totient is φ = 1440243156.

The previous prime is 1440243131. The next prime is 1440243191. The reversal of 1440243157 is 7513420441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1434439876 + 5803281 = 37874^2 + 2409^2 .

It is an emirp because it is prime and its reverse (7513420441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1440243157 - 2¹¹ = 1440241109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440240157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720121578 + 720121579.

It is an arithmetic number, because the mean of its divisors is an integer number (720121579).

Almost surely, 2^1440243157 is an apocalyptic number.

It is an amenable number.

1440243157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440243157 is an equidigital number, since it uses as much as digits as its factorization.

1440243157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 1440243157 is about 37950.5356615687. The cubic root of 1440243157 is about 1129.3067920515.

Adding to 1440243157 its reverse (7513420441), we get a palindrome (8953663598).

The spelling of 1440243157 in words is "one billion, four hundred forty million, two hundred forty-three thousand, one hundred fifty-seven".