2018405638 has 8 divisors (see below), whose sum is σ = 3098018088. Its totient is φ = 985732944.

The previous prime is 2018405621. The next prime is 2018405671. The reversal of 2018405638 is 8365048102.

It is a happy number.

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

It is a super-2 number, since 2×2018405638² = 8147922639020374088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2018405597 and 2018405606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11734831 + ... + 11735002.

It is an arithmetic number, because the mean of its divisors is an integer number (387252261).

Almost surely, 2^2018405638 is an apocalyptic number.

2018405638 is a deficient number, since it is larger than the sum of its proper divisors (1079612450).

2018405638 is a wasteful number, since it uses less digits than its factorization.

2018405638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23469878.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 2018405638 is about 44926.6695627441. The cubic root of 2018405638 is about 1263.7741958142.

The spelling of 2018405638 in words is "two billion, eighteen million, four hundred five thousand, six hundred thirty-eight".