731026 has 4 divisors (see below), whose sum is σ = 1096542. Its totient is φ = 365512.

The previous prime is 730999. The next prime is 731033. The reversal of 731026 is 620137.

731026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 855²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 620137 = 7 ⋅88591.

It can be written as a sum of positive squares in only one way, i.e., 731025 + 1 = 855^2 + 1^2 .

It is a junction number, because it is equal to n+sod(n) for n = 730994 and 731012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182755 + ... + 182758.

2⁷³¹⁰²⁶ is an apocalyptic number.

731026 is a deficient number, since it is larger than the sum of its proper divisors (365516).

731026 is a wasteful number, since it uses less digits than its factorization.

731026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365515.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 731026 is about 855.0005847951. Note that the first 3 decimals coincide. The cubic root of 731026 is about 90.0832973679.

Subtracting from 731026 its reverse (620137), we obtain a square (110889 = 333²).

The spelling of 731026 in words is "seven hundred thirty-one thousand, twenty-six".