13818861397 has 8 divisors (see below), whose sum is σ = 15159342240. Its totient is φ = 12492417360.

The previous prime is 13818861389. The next prime is 13818861457. The reversal of 13818861397 is 79316881831.

It is a happy number.

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 13818861397 - 2³ = 13818861389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13818861347) 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, 3507138 + ... + 3511075.

It is an arithmetic number, because the mean of its divisors is an integer number (1894917780).

Almost surely, 2^13818861397 is an apocalyptic number.

It is an amenable number.

13818861397 is a deficient number, since it is larger than the sum of its proper divisors (1340480843).

13818861397 is a wasteful number, since it uses less digits than its factorization.

13818861397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7018403.

The product of its digits is 1741824, while the sum is 55.

The spelling of 13818861397 in words is "thirteen billion, eight hundred eighteen million, eight hundred sixty-one thousand, three hundred ninety-seven".