1243441607939 has 4 divisors (see below), whose sum is σ = 1243446009960. Its totient is φ = 1243437205920.

The previous prime is 1243441607861. The next prime is 1243441607999. The reversal of 1243441607939 is 9397061443421.

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 1243441607939 - 2¹⁶ = 1243441542403 is a prime.

It is a super-2 number, since 2×1243441607939² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243441607999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1745942 + ... + 2352699.

It is an arithmetic number, because the mean of its divisors is an integer number (310861502490).

Almost surely, 2^{1243441607939} is an apocalyptic number.

1243441607939 is a deficient number, since it is larger than the sum of its proper divisors (4402021).

1243441607939 is an equidigital number, since it uses as much as digits as its factorization.

1243441607939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4402020.

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 1243441607939 in words is "one trillion, two hundred forty-three billion, four hundred forty-one million, six hundred seven thousand, nine hundred thirty-nine".