1381878 has 12 divisors (see below), whose sum is σ = 2994108. Its totient is φ = 460620.

The previous prime is 1381871. The next prime is 1381883. The reversal of 1381878 is 8781831.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38368 + ... + 38403.

It is an arithmetic number, because the mean of its divisors is an integer number (249509).

2^1381878 is an apocalyptic number.

1381878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1381878 is an abundant number, since it is smaller than the sum of its proper divisors (1612230).

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

1381878 is a wasteful number, since it uses less digits than its factorization.

1381878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76779 (or 76776 counting only the distinct ones).

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

The square root of 1381878 is about 1175.5330705684. The cubic root of 1381878 is about 111.3841087752.

It can be divided in two parts, 138 and 1878, that added together give a triangular number (2016 = T₆₃).

The spelling of 1381878 in words is "one million, three hundred eighty-one thousand, eight hundred seventy-eight".