1802640 has 160 divisors (see below), whose sum is σ = 6785280. Its totient is φ = 387072.

The previous prime is 1802621. The next prime is 1802641. The reversal of 1802640 is 462081.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1802641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48702 + ... + 48738.

It is an arithmetic number, because the mean of its divisors is an integer number (42408).

2^1802640 is an apocalyptic number.

1802640 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 1802640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3392640).

1802640 is an abundant number, since it is smaller than the sum of its proper divisors (4982640).

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

1802640 is a wasteful number, since it uses less digits than its factorization.

1802640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1802640 is about 1342.6242959220. The cubic root of 1802640 is about 121.7034812802.

It can be divided in two parts, 1802 and 640, that added together give a palindrome (2442).

The spelling of 1802640 in words is "one million, eight hundred two thousand, six hundred forty".