1381040 has 40 divisors (see below), whose sum is σ = 3275088. Its totient is φ = 541440.

The previous prime is 1381033. The next prime is 1381043. The reversal of 1381040 is 401831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381043) 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, 4739 + ... + 5021.

2^1381040 is an apocalyptic number.

1381040 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 1381040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1637544).

1381040 is an abundant number, since it is smaller than the sum of its proper divisors (1894048).

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

1381040 is a wasteful number, since it uses less digits than its factorization.

1381040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1381040 is about 1175.1765824760. The cubic root of 1381040 is about 111.3615889972.

Adding to 1381040 its reverse (401831), we get a palindrome (1782871).

The spelling of 1381040 in words is "one million, three hundred eighty-one thousand, forty".