1240273 has 2 divisors, whose sum is σ = 1240274. Its totient is φ = 1240272.

The previous prime is 1240271. The next prime is 1240307. The reversal of 1240273 is 3720421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1203409 + 36864 = 1097^2 + 192^2 .

It is an emirp because it is prime and its reverse (3720421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240273 - 2¹ = 1240271 is a prime.

It is a super-2 number, since 2×1240273² = 3076554229058, which contains 22 as substring.

Together with 1240271, it forms a pair of twin primes.

It is an Ulam number.

1240273 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1240273.

It is not a weakly prime, because it can be changed into another prime (1240271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620136 + 620137.

It is an arithmetic number, because the mean of its divisors is an integer number (620137).

2^1240273 is an apocalyptic number.

It is an amenable number.

1240273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240273 is an equidigital number, since it uses as much as digits as its factorization.

1240273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 1240273 is about 1113.6754464385. The cubic root of 1240273 is about 107.4415907682.

Adding to 1240273 its reverse (3720421), we get a palindrome (4960694).

The spelling of 1240273 in words is "one million, two hundred forty thousand, two hundred seventy-three".