730020421 has 4 divisors (see below), whose sum is σ = 786175852. Its totient is φ = 673864992.

The previous prime is 730020407. The next prime is 730020461. The reversal of 730020421 is 124020037.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124020037 = 29 ⋅4276553.

It can be written as a sum of positive squares in 2 ways, for example, as 470456100 + 259564321 = 21690^2 + 16111^2 .

It is a cyclic number.

It is not a de Polignac number, because 730020421 - 2¹³ = 730012229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730020461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28077696 + ... + 28077721.

It is an arithmetic number, because the mean of its divisors is an integer number (196543963).

Almost surely, 2^730020421 is an apocalyptic number.

It is an amenable number.

730020421 is a deficient number, since it is larger than the sum of its proper divisors (56155431).

730020421 is a wasteful number, since it uses less digits than its factorization.

730020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56155430.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 730020421 is about 27018.8900771294. The cubic root of 730020421 is about 900.4197305584.

Adding to 730020421 its reverse (124020037), we get a palindrome (854040458).

The spelling of 730020421 in words is "seven hundred thirty million, twenty thousand, four hundred twenty-one".