406618138 has 8 divisors (see below), whose sum is σ = 645805332. Its totient is φ = 191349696.

The previous prime is 406618111. The next prime is 406618141. The reversal of 406618138 is 831816604.

It can be written as a sum of positive squares in 2 ways, for example, as 316235089 + 90383049 = 17783^2 + 9507^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 406618097 and 406618106.

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, 5979645 + ... + 5979712.

Almost surely, 2^406618138 is an apocalyptic number.

406618138 is a deficient number, since it is larger than the sum of its proper divisors (239187194).

406618138 is a wasteful number, since it uses less digits than its factorization.

406618138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11959376.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 406618138 is about 20164.7746825994. The cubic root of 406618138 is about 740.8476638941.

The spelling of 406618138 in words is "four hundred six million, six hundred eighteen thousand, one hundred thirty-eight".