400165601 has 8 divisors (see below), whose sum is σ = 462223584. Its totient is φ = 342387520.

The previous prime is 400165589. The next prime is 400165603. The reversal of 400165601 is 106561004.

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

It is a cyclic number.

It is not a de Polignac number, because 400165601 - 2⁶ = 400165537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400165603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1069775 + ... + 1070148.

It is an arithmetic number, because the mean of its divisors is an integer number (57777948).

Almost surely, 2^400165601 is an apocalyptic number.

It is an amenable number.

400165601 is a deficient number, since it is larger than the sum of its proper divisors (62057983).

400165601 is a wasteful number, since it uses less digits than its factorization.

400165601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139951.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 400165601 is about 20004.1395965935. The cubic root of 400165601 is about 736.9079655828.

The spelling of 400165601 in words is "four hundred million, one hundred sixty-five thousand, six hundred one".