401621 has 8 divisors (see below), whose sum is σ = 453600. Its totient is φ = 352240.

The previous prime is 401593. The next prime is 401627. The reversal of 401621 is 126104.

401621 is nontrivially palindromic in base 7.

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 401621 - 2¹⁰ = 400597 is a prime.

It is a super-2 number, since 2×401621² = 322598855282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401596 and 401605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401627) 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, 311 + ... + 948.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2⁴⁰¹⁶²¹ is an apocalyptic number.

It is an amenable number.

401621 is a deficient number, since it is larger than the sum of its proper divisors (51979).

401621 is a wasteful number, since it uses less digits than its factorization.

401621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 401621 is about 633.7357493467. The cubic root of 401621 is about 73.7800260769.

Adding to 401621 its reverse (126104), we get a palindrome (527725).

It can be divided in two parts, 40 and 1621, that added together give a palindrome (1661).

The spelling of 401621 in words is "four hundred one thousand, six hundred twenty-one".