618920 has 16 divisors (see below), whose sum is σ = 1392660. Its totient is φ = 247552.

The previous prime is 618913. The next prime is 618929. The reversal of 618920 is 29816.

618920 = T₂₁₅ + T₂₁₆ + ... + T₂₃₈.

It can be written as a sum of positive squares in 2 ways, for example, as 611524 + 7396 = 782^2 + 86^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 618920.

It is not an unprimeable number, because it can be changed into a prime (618929) by changing a digit.

618920 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7697 + ... + 7776.

2⁶¹⁸⁹²⁰ is an apocalyptic number.

It is an amenable number.

618920 is an abundant number, since it is smaller than the sum of its proper divisors (773740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

618920 is a wasteful number, since it uses less digits than its factorization.

618920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15484 (or 15480 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 618920 is about 786.7146877998. The cubic root of 618920 is about 85.2206493331.

The spelling of 618920 in words is "six hundred eighteen thousand, nine hundred twenty".