1138878 has 48 divisors (see below), whose sum is σ = 2760576. Its totient is φ = 336960.

The previous prime is 1138867. The next prime is 1138883. The reversal of 1138878 is 8788311.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7176 + ... + 7332.

It is an arithmetic number, because the mean of its divisors is an integer number (57512).

2^1138878 is an apocalyptic number.

1138878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1380288).

1138878 is an abundant number, since it is smaller than the sum of its proper divisors (1621698).

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

1138878 is a wasteful number, since it uses less digits than its factorization.

1138878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 206 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 1138878 is about 1067.1822712171. The cubic root of 1138878 is about 104.4301097809.

It can be divided in two parts, 1138 and 878, that added together give a triangular number (2016 = T₆₃).

The spelling of 1138878 in words is "one million, one hundred thirty-eight thousand, eight hundred seventy-eight".