1219907399644 has 12 divisors (see below), whose sum is σ = 2175117911064. Its totient is φ = 598445139344.

The previous prime is 1219907399603. The next prime is 1219907399681. The reversal of 1219907399644 is 4469937099121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2877139882 + ... + 2877140305.

It is an arithmetic number, because the mean of its divisors is an integer number (181259825922).

Almost surely, 2^{1219907399644} is an apocalyptic number.

It is an amenable number.

1219907399644 is a deficient number, since it is larger than the sum of its proper divisors (955210511420).

1219907399644 is a wasteful number, since it uses less digits than its factorization.

1219907399644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5754280244 (or 5754280242 counting only the distinct ones).

The product of its (nonzero) digits is 26453952, while the sum is 64.

The spelling of 1219907399644 in words is "one trillion, two hundred nineteen billion, nine hundred seven million, three hundred ninety-nine thousand, six hundred forty-four".