618742 has 4 divisors (see below), whose sum is σ = 928116. Its totient is φ = 309370.

The previous prime is 618719. The next prime is 618799. The reversal of 618742 is 247816.

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

It is a self number, because there is not a number n which added to its sum of digits gives 618742.

It is a congruent number.

It is an unprimeable number.

618742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154684 + ... + 154687.

It is an arithmetic number, because the mean of its divisors is an integer number (232029).

2⁶¹⁸⁷⁴² is an apocalyptic number.

618742 is a deficient number, since it is larger than the sum of its proper divisors (309374).

618742 is a wasteful number, since it uses less digits than its factorization.

618742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309373.

The product of its digits is 2688, while the sum is 28.

The square root of 618742 is about 786.6015509774. The cubic root of 618742 is about 85.2124787941.

The spelling of 618742 in words is "six hundred eighteen thousand, seven hundred forty-two".