405664158 has 8 divisors (see below), whose sum is σ = 811328328. Its totient is φ = 135221384.

The previous prime is 405664157. The next prime is 405664187. The reversal of 405664158 is 851466504.

It is a happy number.

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

405664158 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405664157) 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, 33805341 + ... + 33805352.

It is an arithmetic number, because the mean of its divisors is an integer number (101416041).

Almost surely, 2^405664158 is an apocalyptic number.

405664158 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405664158 is a wasteful number, since it uses less digits than its factorization.

405664158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67610698.

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 405664158 is about 20141.1061761761. The cubic root of 405664158 is about 740.2678346288.

The spelling of 405664158 in words is "four hundred five million, six hundred sixty-four thousand, one hundred fifty-eight".