403621 has 2 divisors, whose sum is σ = 403622. Its totient is φ = 403620.

The previous prime is 403607. The next prime is 403649. The reversal of 403621 is 126304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390625 + 12996 = 625^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 403621 - 2¹³ = 395429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 403595 and 403604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201810 + 201811.

It is an arithmetic number, because the mean of its divisors is an integer number (201811).

2⁴⁰³⁶²¹ is an apocalyptic number.

It is an amenable number.

403621 is a deficient number, since it is larger than the sum of its proper divisors (1).

403621 is an equidigital number, since it uses as much as digits as its factorization.

403621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 403621 is about 635.3117345052. The cubic root of 403621 is about 73.9022937428.

Adding to 403621 its reverse (126304), we get a palindrome (529925).

It can be divided in two parts, 403 and 621, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 403621 in words is "four hundred three thousand, six hundred twenty-one".