731389 has 2 divisors, whose sum is σ = 731390. Its totient is φ = 731388.

The previous prime is 731369. The next prime is 731413. The reversal of 731389 is 983137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412164 + 319225 = 642^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 731389 - 2⁷ = 731261 is a prime.

731389 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 731389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (731359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365694 + 365695.

It is an arithmetic number, because the mean of its divisors is an integer number (365695).

2⁷³¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

731389 is a deficient number, since it is larger than the sum of its proper divisors (1).

731389 is an equidigital number, since it uses as much as digits as its factorization.

731389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 731389 is about 855.2128390056. The cubic root of 731389 is about 90.0982055590.

The spelling of 731389 in words is "seven hundred thirty-one thousand, three hundred eighty-nine".