730989 has 24 divisors (see below), whose sum is σ = 1240512. Its totient is φ = 406080.

The previous prime is 730973. The next prime is 730993. The reversal of 730989 is 989037.

730989 = 113² + 114² + ... + 153².

It is not a de Polignac number, because 730989 - 2⁴ = 730973 is a prime.

It is a Curzon number.

730989 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 730989.

It is not an unprimeable number, because it can be changed into a prime (730909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2442 + ... + 2724.

It is an arithmetic number, because the mean of its divisors is an integer number (51688).

2⁷³⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

730989 is a deficient number, since it is larger than the sum of its proper divisors (509523).

730989 is a wasteful number, since it uses less digits than its factorization.

730989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 730989 is about 854.9789471092. The cubic root of 730989 is about 90.0817775231.

Adding to 730989 its sum of digits (36), we get a square (731025 = 855²).

The spelling of 730989 in words is "seven hundred thirty thousand, nine hundred eighty-nine".