1878640 has 40 divisors (see below), whose sum is σ = 4562208. Its totient is φ = 718080.

The previous prime is 1878629. The next prime is 1878641. The reversal of 1878640 is 468781.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1878596 and 1878605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1878641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1330 + ... + 2350.

2^1878640 is an apocalyptic number.

1878640 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 1878640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2281104).

1878640 is an abundant number, since it is smaller than the sum of its proper divisors (2683568).

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

1878640 is a wasteful number, since it uses less digits than its factorization.

1878640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057 (or 1051 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1878640 is about 1370.6348893852. The cubic root of 1878640 is about 123.3903477973.

The spelling of 1878640 in words is "one million, eight hundred seventy-eight thousand, six hundred forty".