401210665 has 16 divisors (see below), whose sum is σ = 490490640. Its totient is φ = 314997760.

The previous prime is 401210657. The next prime is 401210713. The reversal of 401210665 is 566012104.

It can be written as a sum of positive squares in 8 ways, for example, as 42146064 + 359064601 = 6492^2 + 18949^2 .

It is not a de Polignac number, because 401210665 - 2³ = 401210657 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57675 + ... + 64255.

It is an arithmetic number, because the mean of its divisors is an integer number (30655665).

Almost surely, 2^401210665 is an apocalyptic number.

It is an amenable number.

401210665 is a deficient number, since it is larger than the sum of its proper divisors (89279975).

401210665 is a wasteful number, since it uses less digits than its factorization.

401210665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6812.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 401210665 is about 20030.2437578777. The cubic root of 401210665 is about 737.5489056911.

Adding to 401210665 its reverse (566012104), we get a palindrome (967222769).

The spelling of 401210665 in words is "four hundred one million, two hundred ten thousand, six hundred sixty-five".