401540165 has 8 divisors (see below), whose sum is σ = 518913528. Its totient is φ = 296521920.

The previous prime is 401540159. The next prime is 401540171. The reversal of 401540165 is 561045104.

It is an interprime number because it is at equal distance from previous prime (401540159) and next prime (401540171).

It can be written as a sum of positive squares in 4 ways, for example, as 4056196 + 397483969 = 2014^2 + 19937^2 .

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

It is not a de Polignac number, because 401540165 - 2⁸ = 401539909 is a prime.

It is a super-2 number, since 2×401540165² = 322469008216454450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3088706 + ... + 3088835.

It is an arithmetic number, because the mean of its divisors is an integer number (64864191).

Almost surely, 2^401540165 is an apocalyptic number.

It is an amenable number.

401540165 is a deficient number, since it is larger than the sum of its proper divisors (117373363).

401540165 is a wasteful number, since it uses less digits than its factorization.

401540165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6177559.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 401540165 is about 20038.4671319939. The cubic root of 401540165 is about 737.7507579742.

Adding to 401540165 its reverse (561045104), we get a palindrome (962585269).

The spelling of 401540165 in words is "four hundred one million, five hundred forty thousand, one hundred sixty-five".