13209400385 has 8 divisors (see below), whose sum is σ = 16397876520. Its totient is φ = 10203122944.

The previous prime is 13209400349. The next prime is 13209400387. The reversal of 13209400385 is 58300490231.

It can be written as a sum of positive squares in 4 ways, for example, as 4543838464 + 8665561921 = 67408^2 + 93089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13209400385 - 2¹⁰ = 13209399361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13209400387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45549512 + ... + 45549801.

It is an arithmetic number, because the mean of its divisors is an integer number (2049734565).

Almost surely, 2^13209400385 is an apocalyptic number.

It is an amenable number.

13209400385 is a deficient number, since it is larger than the sum of its proper divisors (3188476135).

13209400385 is an equidigital number, since it uses as much as digits as its factorization.

13209400385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91099347.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 13209400385 in words is "thirteen billion, two hundred nine million, four hundred thousand, three hundred eighty-five".