1618820349 has 8 divisors (see below), whose sum is σ = 2272028640. Its totient is φ = 1022412816.

The previous prime is 1618820267. The next prime is 1618820353. The reversal of 1618820349 is 9430288161.

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

It is not a de Polignac number, because 1618820349 - 2⁷ = 1618820221 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1618820349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618820369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14200122 + ... + 14200235.

It is an arithmetic number, because the mean of its divisors is an integer number (284003580).

Almost surely, 2^1618820349 is an apocalyptic number.

1618820349 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1618820349 is a deficient number, since it is larger than the sum of its proper divisors (653208291).

1618820349 is a wasteful number, since it uses less digits than its factorization.

1618820349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28400379.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 1618820349 is about 40234.5665939128. The cubic root of 1618820349 is about 1174.1751504410.

The spelling of 1618820349 in words is "one billion, six hundred eighteen million, eight hundred twenty thousand, three hundred forty-nine".