618638 has 8 divisors (see below), whose sum is σ = 932088. Its totient is φ = 307944.

The previous prime is 618637. The next prime is 618643. The reversal of 618638 is 836816.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618637) 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, 20 + ... + 1112.

It is an arithmetic number, because the mean of its divisors is an integer number (116511).

2⁶¹⁸⁶³⁸ is an apocalyptic number.

618638 is a deficient number, since it is larger than the sum of its proper divisors (313450).

618638 is a wasteful number, since it uses less digits than its factorization.

618638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378.

The product of its digits is 6912, while the sum is 32.

The square root of 618638 is about 786.5354410324. The cubic root of 618638 is about 85.2077042707.

The spelling of 618638 in words is "six hundred eighteen thousand, six hundred thirty-eight".