1840520 has 64 divisors (see below), whose sum is σ = 4665600. Its totient is φ = 647680.

The previous prime is 1840519. The next prime is 1840537. The reversal of 1840520 is 250481.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1840492 and 1840501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20636 + ... + 20724.

It is an arithmetic number, because the mean of its divisors is an integer number (72900).

2^1840520 is an apocalyptic number.

1840520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1840520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2332800).

1840520 is an abundant number, since it is smaller than the sum of its proper divisors (2825080).

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

1840520 is a wasteful number, since it uses less digits than its factorization.

1840520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1840520 is about 1356.6576576277. The cubic root of 1840520 is about 122.5500559005.

The spelling of 1840520 in words is "one million, eight hundred forty thousand, five hundred twenty".