618138423 has 24 divisors (see below), whose sum is σ = 1033344000. Its totient is φ = 348747984.

The previous prime is 618138401. The next prime is 618138431. The reversal of 618138423 is 324831816.

618138423 is a `hidden beast` number, since 618 + 1 + 38 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 618138423 - 2¹⁴ = 618122039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618138463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57123 + ... + 67076.

It is an arithmetic number, because the mean of its divisors is an integer number (43056000).

Almost surely, 2^618138423 is an apocalyptic number.

618138423 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

618138423 is a deficient number, since it is larger than the sum of its proper divisors (415205577).

618138423 is a wasteful number, since it uses less digits than its factorization.

618138423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124291 (or 124288 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 618138423 is about 24862.3897282622. The cubic root of 618138423 is about 851.8476178909.

The spelling of 618138423 in words is "six hundred eighteen million, one hundred thirty-eight thousand, four hundred twenty-three".