730981 has 4 divisors (see below), whose sum is σ = 739872. Its totient is φ = 722092.

The previous prime is 730973. The next prime is 730993. The reversal of 730981 is 189037.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189037 = 23 ⋅8219.

It is a cyclic number.

It is not a de Polignac number, because 730981 - 2³ = 730973 is a prime.

It is a super-2 number, since 2×730981² = 1068666444722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4321 + ... + 4486.

It is an arithmetic number, because the mean of its divisors is an integer number (184968).

2⁷³⁰⁹⁸¹ is an apocalyptic number.

It is an amenable number.

730981 is a deficient number, since it is larger than the sum of its proper divisors (8891).

730981 is an equidigital number, since it uses as much as digits as its factorization.

730981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8890.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 730981 is about 854.9742686187. The cubic root of 730981 is about 90.0814489012.

It can be divided in two parts, 730 and 981, that added together give a triangular number (1711 = T₅₈).

The spelling of 730981 in words is "seven hundred thirty thousand, nine hundred eighty-one".