1394487951669 has 12 divisors (see below), whose sum is σ = 2014345313292. Its totient is φ = 929619432000.

The previous prime is 1394487951667. The next prime is 1394487951671. The reversal of 1394487951669 is 9661597844931.

It is a happy number.

1394487951669 is a `hidden beast` number, since 1 + 3 + 9 + 4 + 48 + 7 + 9 + 516 + 69 = 666.

It is an interprime number because it is at equal distance from previous prime (1394487951667) and next prime (1394487951671).

It can be written as a sum of positive squares in 2 ways, for example, as 438062630769 + 956425320900 = 661863^2 + 977970^2 .

It is not a de Polignac number, because 1394487951669 - 2¹ = 1394487951667 is a prime.

It is a super-2 number, since 2×1394487951669² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1394487951597 and 1394487951606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1394487951667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3040762 + ... + 3469179.

It is an arithmetic number, because the mean of its divisors is an integer number (167862109441).

Almost surely, 2^{1394487951669} is an apocalyptic number.

It is an amenable number.

1394487951669 is a deficient number, since it is larger than the sum of its proper divisors (619857361623).

1394487951669 is a wasteful number, since it uses less digits than its factorization.

1394487951669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6533748 (or 6533745 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 72.

The spelling of 1394487951669 in words is "one trillion, three hundred ninety-four billion, four hundred eighty-seven million, nine hundred fifty-one thousand, six hundred sixty-nine".