401221242 has 16 divisors (see below), whose sum is σ = 891602880. Its totient is φ = 133740396.

The previous prime is 401221237. The next prime is 401221243. The reversal of 401221242 is 242122104.

401221242 is a `hidden beast` number, since 401 + 2 + 21 + 242 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (401221243) by changing a digit.

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, 3714958 + ... + 3715065.

It is an arithmetic number, because the mean of its divisors is an integer number (55725180).

Almost surely, 2^401221242 is an apocalyptic number.

401221242 is an abundant number, since it is smaller than the sum of its proper divisors (490381638).

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

401221242 is a wasteful number, since it uses less digits than its factorization.

401221242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7430034 (or 7430028 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 401221242 is about 20030.5077818811. The cubic root of 401221242 is about 737.5553868965. Note that the first 3 decimals are identical.

Adding to 401221242 its reverse (242122104), we get a palindrome (643343346).

The spelling of 401221242 in words is "four hundred one million, two hundred twenty-one thousand, two hundred forty-two".