1381140 has 36 divisors (see below), whose sum is σ = 4190004. Its totient is φ = 368256.
The previous prime is 1381111. The next prime is 1381141. The reversal of 1381140 is 411831.
It can be written as a sum of positive squares in 2 ways, for example, as 685584 + 695556 = 828^2 + 834^2 .
It is a tau number, because it is divible by the number of its divisors (36).
It is a Harshad number since it is a multiple of its sum of digits (18).
It is an Ulam number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1381141) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3657 + ... + 4016.
It is an arithmetic number, because the mean of its divisors is an integer number (116389).
21381140 is an apocalyptic number.
1381140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
1381140 is an abundant number, since it is smaller than the sum of its proper divisors (2808864).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1381140 is a wasteful number, since it uses less digits than its factorization.
1381140 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7688 (or 7683 counting only the distinct ones).
The product of its (nonzero) digits is 96, while the sum is 18.
The square root of 1381140 is about 1175.2191285033. The cubic root of 1381140 is about 111.3642768002.
Adding to 1381140 its reverse (411831), we get a palindrome (1792971).
It can be divided in two parts, 1381 and 140, that added together give a square (1521 = 392).
The spelling of 1381140 in words is "one million, three hundred eighty-one thousand, one hundred forty".
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