1229440871 has 4 divisors (see below), whose sum is σ = 1236233544. Its totient is φ = 1222648200.

The previous prime is 1229440859. The next prime is 1229440889. The reversal of 1229440871 is 1780449221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1229440871 - 2¹⁴ = 1229424487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229440271) 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, 3396065 + ... + 3396426.

It is an arithmetic number, because the mean of its divisors is an integer number (309058386).

Almost surely, 2^1229440871 is an apocalyptic number.

1229440871 is a deficient number, since it is larger than the sum of its proper divisors (6792673).

1229440871 is an equidigital number, since it uses as much as digits as its factorization.

1229440871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6792672.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 1229440871 is about 35063.3836216644. The cubic root of 1229440871 is about 1071.2788944378.

The spelling of 1229440871 in words is "one billion, two hundred twenty-nine million, four hundred forty thousand, eight hundred seventy-one".