730621 has 4 divisors (see below), whose sum is σ = 736092. Its totient is φ = 725152.

The previous prime is 730619. The next prime is 730633. The reversal of 730621 is 126037.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 632025 + 98596 = 795^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 730621 - 2¹ = 730619 is a prime.

It is a Duffinian number.

730621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2530 + ... + 2803.

It is an arithmetic number, because the mean of its divisors is an integer number (184023).

2⁷³⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

730621 is a deficient number, since it is larger than the sum of its proper divisors (5471).

730621 is a wasteful number, since it uses less digits than its factorization.

730621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5470.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 730621 is about 854.7637100392. The cubic root of 730621 is about 90.0666584362.

Adding to 730621 its reverse (126037), we get a palindrome (856658).

It can be divided in two parts, 7 and 30621, that added together give a triangular number (30628 = T₂₄₇).

The spelling of 730621 in words is "seven hundred thirty thousand, six hundred twenty-one".