18400405357 has 4 divisors (see below), whose sum is σ = 18442320160. Its totient is φ = 18358490556.

The previous prime is 18400405321. The next prime is 18400405367. The reversal of 18400405357 is 75350400481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18400405357 - 2¹¹ = 18400403309 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 (18400405307) 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, 20956743 + ... + 20957620.

It is an arithmetic number, because the mean of its divisors is an integer number (4610580040).

Almost surely, 2^18400405357 is an apocalyptic number.

It is an amenable number.

18400405357 is a deficient number, since it is larger than the sum of its proper divisors (41914803).

18400405357 is an equidigital number, since it uses as much as digits as its factorization.

18400405357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41914802.

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 18400405357 in words is "eighteen billion, four hundred million, four hundred five thousand, three hundred fifty-seven".