1240802261 has 4 divisors (see below), whose sum is σ = 1241702124. Its totient is φ = 1239902400.

The previous prime is 1240802257. The next prime is 1240802267. The reversal of 1240802261 is 1622080421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 418202500 + 822599761 = 20450^2 + 28681^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240802261 - 2² = 1240802257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1240802261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240802267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447860 + ... + 450621.

It is an arithmetic number, because the mean of its divisors is an integer number (310425531).

Almost surely, 2^1240802261 is an apocalyptic number.

It is an amenable number.

1240802261 is a deficient number, since it is larger than the sum of its proper divisors (899863).

1240802261 is an equidigital number, since it uses as much as digits as its factorization.

1240802261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899862.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 1240802261 is about 35225.0232221357. The cubic root of 1240802261 is about 1074.5687142474.

Adding to 1240802261 its reverse (1622080421), we get a palindrome (2862882682).

The spelling of 1240802261 in words is "one billion, two hundred forty million, eight hundred two thousand, two hundred sixty-one".