1381860 has 60 divisors (see below), whose sum is σ = 4340028. Its totient is φ = 368064.

The previous prime is 1381859. The next prime is 1381871. The reversal of 1381860 is 681831.

It can be written as a sum of positive squares in 2 ways, for example, as 254016 + 1127844 = 504^2 + 1062^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1194 + ... + 2046.

2^1381860 is an apocalyptic number.

1381860 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 1381860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2170014).

1381860 is an abundant number, since it is smaller than the sum of its proper divisors (2958168).

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

1381860 is a wasteful number, since it uses less digits than its factorization.

1381860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1381860 is about 1175.5254144424. The cubic root of 1381860 is about 111.3836251525.

The spelling of 1381860 in words is "one million, three hundred eighty-one thousand, eight hundred sixty".