730409621 has 4 divisors (see below), whose sum is σ = 730480044. Its totient is φ = 730339200.

The previous prime is 730409591. The next prime is 730409663. The reversal of 730409621 is 126904037.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 126904037 = 13 ⋅9761849.

It can be written as a sum of positive squares in 2 ways, for example, as 206640625 + 523768996 = 14375^2 + 22886^2 .

It is a cyclic number.

It is not a de Polignac number, because 730409621 - 2¹⁸ = 730147477 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 (730409671) 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, 16250 + ... + 41531.

It is an arithmetic number, because the mean of its divisors is an integer number (182620011).

Almost surely, 2^730409621 is an apocalyptic number.

It is an amenable number.

730409621 is a deficient number, since it is larger than the sum of its proper divisors (70423).

730409621 is a wasteful number, since it uses less digits than its factorization.

730409621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70422.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 730409621 is about 27026.0914858216. The cubic root of 730409621 is about 900.5797174526.

The spelling of 730409621 in words is "seven hundred thirty million, four hundred nine thousand, six hundred twenty-one".