18438760349 has 4 divisors (see below), whose sum is σ = 19409221440. Its totient is φ = 17468299260.

The previous prime is 18438760321. The next prime is 18438760363. The reversal of 18438760349 is 94306783481.

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 a de Polignac number, because none of the positive numbers 2^k-18438760349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18438760349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18438750349) 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, 485230517 + ... + 485230554.

It is an arithmetic number, because the mean of its divisors is an integer number (4852305360).

Almost surely, 2^18438760349 is an apocalyptic number.

18438760349 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18438760349 is a deficient number, since it is larger than the sum of its proper divisors (970461091).

18438760349 is an equidigital number, since it uses as much as digits as its factorization.

18438760349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970461090.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 18438760349 in words is "eighteen billion, four hundred thirty-eight million, seven hundred sixty thousand, three hundred forty-nine".