1888640 has 64 divisors (see below), whose sum is σ = 4883760. Its totient is φ = 694272.

The previous prime is 1888633. The next prime is 1888651. The reversal of 1888640 is 468881.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1888640² = 7133922099200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1888640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8207 + ... + 8433.

2^1888640 is an apocalyptic number.

1888640 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 1888640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2441880).

1888640 is an abundant number, since it is smaller than the sum of its proper divisors (2995120).

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

1888640 is a wasteful number, since it uses less digits than its factorization.

1888640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 1888640 is about 1374.2779922563. The cubic root of 1888640 is about 123.6088960686.

The spelling of 1888640 in words is "one million, eight hundred eighty-eight thousand, six hundred forty".