1261205344 has 24 divisors (see below), whose sum is σ = 2837712528. Its totient is φ = 540516480.

The previous prime is 1261205339. The next prime is 1261205353. The reversal of 1261205344 is 4435021621.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2814967 + ... + 2815414.

It is an arithmetic number, because the mean of its divisors is an integer number (118238022).

Almost surely, 2^1261205344 is an apocalyptic number.

1261205344 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1261205344 is an abundant number, since it is smaller than the sum of its proper divisors (1576507184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261205344 is an equidigital number, since it uses as much as digits as its factorization.

1261205344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5630398 (or 5630390 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1261205344 is about 35513.4530002364. The cubic root of 1261205344 is about 1080.4265987329.

Adding to 1261205344 its reverse (4435021621), we get a palindrome (5696226965).

The spelling of 1261205344 in words is "one billion, two hundred sixty-one million, two hundred five thousand, three hundred forty-four".