618623391 has 8 divisors (see below), whose sum is σ = 824978560. Its totient is φ = 412341912.

The previous prime is 618623371. The next prime is 618623393. The reversal of 618623391 is 193326816.

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

It is not a de Polignac number, because 618623391 - 2¹¹ = 618621343 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 (618623393) 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, 5670 + ... + 35628.

It is an arithmetic number, because the mean of its divisors is an integer number (103122320).

Almost surely, 2^618623391 is an apocalyptic number.

618623391 is a deficient number, since it is larger than the sum of its proper divisors (206355169).

618623391 is a wasteful number, since it uses less digits than its factorization.

618623391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36845.

The product of its digits is 46656, while the sum is 39.

The square root of 618623391 is about 24872.1408608105. The cubic root of 618623391 is about 852.0703354507.

The spelling of 618623391 in words is "six hundred eighteen million, six hundred twenty-three thousand, three hundred ninety-one".