731629 has 4 divisors (see below), whose sum is σ = 774684. Its totient is φ = 688576.

The previous prime is 731623. The next prime is 731639. The reversal of 731629 is 926137.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 926137 = 761 ⋅1217.

It can be written as a sum of positive squares in 2 ways, for example, as 227529 + 504100 = 477^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 731629 - 2⁵ = 731597 is a prime.

It is an Ulam number.

It is a Duffinian number.

731629 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 731597 and 731606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731623) 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, 21502 + ... + 21535.

It is an arithmetic number, because the mean of its divisors is an integer number (193671).

2⁷³¹⁶²⁹ is an apocalyptic number.

It is an amenable number.

731629 is a deficient number, since it is larger than the sum of its proper divisors (43055).

731629 is a wasteful number, since it uses less digits than its factorization.

731629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43054.

The product of its digits is 2268, while the sum is 28.

The square root of 731629 is about 855.3531434443. The cubic root of 731629 is about 90.1080595056.

The spelling of 731629 in words is "seven hundred thirty-one thousand, six hundred twenty-nine".