1399664089476 has 81 divisors (see below), whose sum is σ = 3698987233669. Its totient is φ = 446217654432.

The previous prime is 1399664089457. The next prime is 1399664089477. The reversal of 1399664089476 is 6749804669931.

The square root of 1399664089476 is 1183074.

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

1399664089476 is a `hidden beast` number, since 1 + 3 + 9 + 9 + 66 + 408 + 94 + 76 = 666.

It can be written as a sum of positive squares in only one way, i.e., 452592562500 + 947071526976 = 672750^2 + 973176^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1399664089477) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 163259926 + ... + 163268498.

Almost surely, 2^{1399664089476} is an apocalyptic number.

1399664089476 is the 1183074-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1399664089476

1399664089476 is an abundant number, since it is smaller than the sum of its proper divisors (2299323144193).

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

1399664089476 is an frugal number, since it uses more digits than its factorization.

1399664089476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17202 (or 8601 counting only the distinct ones).

The product of its (nonzero) digits is 423263232, while the sum is 72.

The spelling of 1399664089476 in words is "one trillion, three hundred ninety-nine billion, six hundred sixty-four million, eighty-nine thousand, four hundred seventy-six".