618973 has 4 divisors (see below), whose sum is σ = 635740. Its totient is φ = 602208.

The previous prime is 618971. The next prime is 618979. The reversal of 618973 is 379816.

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

It can be written as a sum of positive squares in 2 ways, for example, as 487204 + 131769 = 698^2 + 363^2 .

It is a cyclic number.

It is not a de Polignac number, because 618973 - 2¹ = 618971 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618971) 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, 8328 + ... + 8401.

It is an arithmetic number, because the mean of its divisors is an integer number (158935).

2⁶¹⁸⁹⁷³ is an apocalyptic number.

It is an amenable number.

618973 is a deficient number, since it is larger than the sum of its proper divisors (16767).

618973 is a wasteful number, since it uses less digits than its factorization.

618973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16766.

The product of its digits is 9072, while the sum is 34.

The square root of 618973 is about 786.7483714632. The cubic root of 618973 is about 85.2230818314.

The spelling of 618973 in words is "six hundred eighteen thousand, nine hundred seventy-three".