619840 has 56 divisors (see below), whose sum is σ = 1600200. Its totient is φ = 227328.

The previous prime is 619831. The next prime is 619841. The reversal of 619840 is 48916.

It can be written as a sum of positive squares in 4 ways, for example, as 5184 + 614656 = 72^2 + 784^2 .

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 619799 and 619808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (619841) by changing a digit.

619840 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 7 ways as a sum of consecutive naturals, for example, 4086 + ... + 4234.

It is an arithmetic number, because the mean of its divisors is an integer number (28575).

2⁶¹⁹⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 619840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800100).

619840 is an abundant number, since it is smaller than the sum of its proper divisors (980360).

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

619840 is a wasteful number, since it uses less digits than its factorization.

619840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 619840 is about 787.2991807439. The cubic root of 619840 is about 85.2628541317.

The spelling of 619840 in words is "six hundred nineteen thousand, eight hundred forty".