1391944612644 has 48 divisors (see below), whose sum is σ = 3608989587840. Its totient is φ = 463950128160.

The previous prime is 1391944612607. The next prime is 1391944612691. The reversal of 1391944612644 is 4462164491931.

1391944612644 is a `hidden beast` number, since 1 + 3 + 9 + 19 + 4 + 4 + 612 + 6 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1194622 + ... + 2052074.

It is an arithmetic number, because the mean of its divisors is an integer number (75187283080).

Almost surely, 2^{1391944612644} is an apocalyptic number.

It is an amenable number.

1391944612644 is an abundant number, since it is smaller than the sum of its proper divisors (2217044975196).

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

1391944612644 is a wasteful number, since it uses less digits than its factorization.

1391944612644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872497 (or 872489 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The spelling of 1391944612644 in words is "one trillion, three hundred ninety-one billion, nine hundred forty-four million, six hundred twelve thousand, six hundred forty-four".