401563642 has 16 divisors (see below), whose sum is σ = 607852800. Its totient is φ = 198952848.

The previous prime is 401563619. The next prime is 401563649. The reversal of 401563642 is 246365104.

It is a super-2 number, since 2×401563642² = 322506717152608328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401563649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143743 + ... + 146509.

It is an arithmetic number, because the mean of its divisors is an integer number (37990800).

Almost surely, 2^401563642 is an apocalyptic number.

401563642 is a deficient number, since it is larger than the sum of its proper divisors (206289158).

401563642 is a wasteful number, since it uses less digits than its factorization.

401563642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3405.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 401563642 is about 20039.0529217326. The cubic root of 401563642 is about 737.7651358111.

The spelling of 401563642 in words is "four hundred one million, five hundred sixty-three thousand, six hundred forty-two".