1398951969529 has 9 divisors (see below), whose sum is σ = 1423135892037. Its totient is φ = 1375172318364.

The previous prime is 1398951969521. The next prime is 1398951969533. The reversal of 1398951969529 is 9259691598931.

The square root of 1398951969529 is 1182773.

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

It is not a de Polignac number, because 1398951969529 - 2³ = 1398951969521 is a prime.

It is a super-2 number, since 2×1398951969529² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398951969521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 69773584 + ... + 69793630.

Almost surely, 2^{1398951969529} is an apocalyptic number.

1398951969529 is the 1182773-rd square number.

1398951969529 is the 591387-th centered octagonal number.

It is an amenable number.

1398951969529 is a deficient number, since it is larger than the sum of its proper divisors (24183922508).

1398951969529 is an frugal number, since it uses more digits than its factorization.

1398951969529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40212 (or 20106 counting only the distinct ones).

The product of its digits is 425152800, while the sum is 76.

The spelling of 1398951969529 in words is "one trillion, three hundred ninety-eight billion, nine hundred fifty-one million, nine hundred sixty-nine thousand, five hundred twenty-nine".