1798640 has 20 divisors (see below), whose sum is σ = 4182024. Its totient is φ = 719424.

The previous prime is 1798639. The next prime is 1798649. The reversal of 1798640 is 468971.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 1798640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1798649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11162 + ... + 11321.

2^1798640 is an apocalyptic number.

1798640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1798640 is an abundant number, since it is smaller than the sum of its proper divisors (2383384).

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

1798640 is a wasteful number, since it uses less digits than its factorization.

1798640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22496 (or 22490 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1798640 is about 1341.1338486520. The cubic root of 1798640 is about 121.6133959157.

The spelling of 1798640 in words is "one million, seven hundred ninety-eight thousand, six hundred forty".