13855973389 has 4 divisors (see below), whose sum is σ = 13856484924. Its totient is φ = 13855461856.

The previous prime is 13855973381. The next prime is 13855973449. The reversal of 13855973389 is 98337955831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5564414025 + 8291559364 = 74595^2 + 91058^2 .

It is a cyclic number.

It is not a de Polignac number, because 13855973389 - 2³ = 13855973381 is a prime.

It is a super-2 number, since 2×13855973389² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13855973381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212722 + ... + 270115.

It is an arithmetic number, because the mean of its divisors is an integer number (3464121231).

Almost surely, 2^13855973389 is an apocalyptic number.

It is an amenable number.

13855973389 is a deficient number, since it is larger than the sum of its proper divisors (511535).

13855973389 is an equidigital number, since it uses as much as digits as its factorization.

13855973389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511534.

The product of its digits is 24494400, while the sum is 61.

The spelling of 13855973389 in words is "thirteen billion, eight hundred fifty-five million, nine hundred seventy-three thousand, three hundred eighty-nine".