401421642 has 16 divisors (see below), whose sum is σ = 819925632. Its totient is φ = 130960160.

The previous prime is 401421623. The next prime is 401421653. The reversal of 401421642 is 246124104.

It is a happy number.

It is a super-2 number, since 2×401421642² = 322278669331952328, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 711459 + ... + 712022.

It is an arithmetic number, because the mean of its divisors is an integer number (51245352).

Almost surely, 2^401421642 is an apocalyptic number.

401421642 is an abundant number, since it is smaller than the sum of its proper divisors (418503990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401421642 is a wasteful number, since it uses less digits than its factorization.

401421642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423533.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 401421642 is about 20035.5095268376. The cubic root of 401421642 is about 737.6781632955.

Adding to 401421642 its reverse (246124104), we get a palindrome (647545746).

The spelling of 401421642 in words is "four hundred one million, four hundred twenty-one thousand, six hundred forty-two".