401023721 has 4 divisors (see below), whose sum is σ = 458312832. Its totient is φ = 343734612.

The previous prime is 401023717. The next prime is 401023729. The reversal of 401023721 is 127320104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401023721 - 2² = 401023717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401023693 and 401023702.

It is not an unprimeable number, because it can be changed into a prime (401023729) 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 3 ways as a sum of consecutive naturals, for example, 28644545 + ... + 28644558.

It is an arithmetic number, because the mean of its divisors is an integer number (114578208).

Almost surely, 2^401023721 is an apocalyptic number.

It is an amenable number.

401023721 is a deficient number, since it is larger than the sum of its proper divisors (57289111).

401023721 is an equidigital number, since it uses as much as digits as its factorization.

401023721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57289110.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 401023721 is about 20025.5766708477. The cubic root of 401023721 is about 737.4343343239.

Adding to 401023721 its reverse (127320104), we get a palindrome (528343825).

The spelling of 401023721 in words is "four hundred one million, twenty-three thousand, seven hundred twenty-one".