401640285 has 16 divisors (see below), whose sum is σ = 664784640. Its totient is φ = 206821440.

The previous prime is 401640271. The next prime is 401640311. The reversal of 401640285 is 582046104.

It is not a de Polignac number, because 401640285 - 2⁴ = 401640269 is a prime.

It is a super-2 number, since 2×401640285² = 322629837069762450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461221 + ... + 462090.

It is an arithmetic number, because the mean of its divisors is an integer number (41549040).

Almost surely, 2^401640285 is an apocalyptic number.

It is an amenable number.

401640285 is a deficient number, since it is larger than the sum of its proper divisors (263144355).

401640285 is a wasteful number, since it uses less digits than its factorization.

401640285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923348.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 401640285 is about 20040.9651713684. The cubic root of 401640285 is about 737.8120697882.

Adding to 401640285 its reverse (582046104), we get a palindrome (983686389).

The spelling of 401640285 in words is "four hundred one million, six hundred forty thousand, two hundred eighty-five".