618990 has 32 divisors (see below), whose sum is σ = 1520640. Its totient is φ = 161184.

The previous prime is 618979. The next prime is 618991. The reversal of 618990 is 99816.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1191 + ... + 1629.

It is an arithmetic number, because the mean of its divisors is an integer number (47520).

2⁶¹⁸⁹⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 618990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (760320).

618990 is an abundant number, since it is smaller than the sum of its proper divisors (901650).

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

618990 is a wasteful number, since it uses less digits than its factorization.

618990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 618990 is about 786.7591753516. The cubic root of 618990 is about 85.2238620372.

The spelling of 618990 in words is "six hundred eighteen thousand, nine hundred ninety".