401221615 has 8 divisors (see below), whose sum is σ = 481995360. Its totient is φ = 320624352.

The previous prime is 401221603. The next prime is 401221619. The reversal of 401221615 is 516122104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401221615 - 2⁹ = 401221103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401221619) 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, 39064 + ... + 48253.

It is an arithmetic number, because the mean of its divisors is an integer number (60249420).

Almost surely, 2^401221615 is an apocalyptic number.

401221615 is a deficient number, since it is larger than the sum of its proper divisors (80773745).

401221615 is an equidigital number, since it uses as much as digits as its factorization.

401221615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88241.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 401221615 is about 20030.5170926764. The cubic root of 401221615 is about 737.5556154554. Note that the first 3 decimals are identical.

Adding to 401221615 its reverse (516122104), we get a palindrome (917343719).

The spelling of 401221615 in words is "four hundred one million, two hundred twenty-one thousand, six hundred fifteen".