731618 has 4 divisors (see below), whose sum is σ = 1097430. Its totient is φ = 365808.

The previous prime is 731611. The next prime is 731623. The reversal of 731618 is 816137.

731618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 677329 + 54289 = 823^2 + 233^2 .

It is not an unprimeable number, because it can be changed into a prime (731611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182903 + ... + 182906.

2⁷³¹⁶¹⁸ is an apocalyptic number.

731618 is a deficient number, since it is larger than the sum of its proper divisors (365812).

731618 is a wasteful number, since it uses less digits than its factorization.

731618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365811.

The product of its digits is 1008, while the sum is 26.

The square root of 731618 is about 855.3467133274. The cubic root of 731618 is about 90.1076079135.

The spelling of 731618 in words is "seven hundred thirty-one thousand, six hundred eighteen".