731623 has 2 divisors, whose sum is σ = 731624. Its totient is φ = 731622.

The previous prime is 731611. The next prime is 731639. The reversal of 731623 is 326137.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 731594 and 731603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (731603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365811 + 365812.

It is an arithmetic number, because the mean of its divisors is an integer number (365812).

2⁷³¹⁶²³ is an apocalyptic number.

731623 is a deficient number, since it is larger than the sum of its proper divisors (1).

731623 is an equidigital number, since it uses as much as digits as its factorization.

731623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 22.

The square root of 731623 is about 855.3496361138. The cubic root of 731623 is about 90.1078131832.

The spelling of 731623 in words is "seven hundred thirty-one thousand, six hundred twenty-three".