401640164 has 24 divisors (see below), whose sum is σ = 783387360. Its totient is φ = 179058816.

The previous prime is 401640163. The next prime is 401640203. The reversal of 401640164 is 461046104.

It is a super-2 number, since 2×401640164² = 322629642675893792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401640163) 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, 154142 + ... + 156725.

It is an arithmetic number, because the mean of its divisors is an integer number (32641140).

Almost surely, 2^401640164 is an apocalyptic number.

It is an amenable number.

401640164 is a deficient number, since it is larger than the sum of its proper divisors (381747196).

401640164 is a wasteful number, since it uses less digits than its factorization.

401640164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310907 (or 310905 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 401640164 is about 20040.9621525515. The cubic root of 401640164 is about 737.8119956959.

Adding to 401640164 its reverse (461046104), we get a palindrome (862686268).

The spelling of 401640164 in words is "four hundred one million, six hundred forty thousand, one hundred sixty-four".