1239966877444 has 9 divisors (see below), whose sum is σ = 2169945932917. Its totient is φ = 619982325184.

The previous prime is 1239966877423. The next prime is 1239966877459. The reversal of 1239966877444 is 4447786699321.

The square root of 1239966877444 is 1113538.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 846285923844 + 393680953600 = 919938^2 + 627440^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1948692 + ... + 2505460.

Almost surely, 2^{1239966877444} is an apocalyptic number.

1239966877444 is the 1113538-th square number.

It is an amenable number.

1239966877444 is a deficient number, since it is larger than the sum of its proper divisors (929979055473).

1239966877444 is an frugal number, since it uses more digits than its factorization.

1239966877444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113542 (or 556771 counting only the distinct ones).

The product of its digits is 438939648, while the sum is 70.

The spelling of 1239966877444 in words is "one trillion, two hundred thirty-nine billion, nine hundred sixty-six million, eight hundred seventy-seven thousand, four hundred forty-four".