1878861 has 8 divisors (see below), whose sum is σ = 2546464. Its totient is φ = 1231920.

The previous prime is 1878841. The next prime is 1878869. The reversal of 1878861 is 1688781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1878861 - 2⁷ = 1878733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1878869) 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, 4951 + ... + 5316.

It is an arithmetic number, because the mean of its divisors is an integer number (318308).

2^1878861 is an apocalyptic number.

It is an amenable number.

1878861 is a deficient number, since it is larger than the sum of its proper divisors (667603).

1878861 is a wasteful number, since it uses less digits than its factorization.

1878861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10331.

The product of its digits is 21504, while the sum is 39.

The square root of 1878861 is about 1370.7155065877. The cubic root of 1878861 is about 123.3951860841.

The spelling of 1878861 in words is "one million, eight hundred seventy-eight thousand, eight hundred sixty-one".