1381740 has 24 divisors (see below), whose sum is σ = 3869040. Its totient is φ = 368448.

The previous prime is 1381739. The next prime is 1381747. The reversal of 1381740 is 471831.

1381740 = 166² + 167² + ... + 205².

It is a self number, because there is not a number n which added to its sum of digits gives 1381740.

It is not an unprimeable number, because it can be changed into a prime (1381747) 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, 11455 + ... + 11574.

It is an arithmetic number, because the mean of its divisors is an integer number (161210).

2^1381740 is an apocalyptic number.

1381740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1381740 is an abundant number, since it is smaller than the sum of its proper divisors (2487300).

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

1381740 is a wasteful number, since it uses less digits than its factorization.

1381740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23041 (or 23039 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 1381740 is about 1175.4743723280. The cubic root of 1381740 is about 111.3804008939.

Subtracting from 1381740 its reverse (471831), we obtain a palindrome (909909).

The spelling of 1381740 in words is "one million, three hundred eighty-one thousand, seven hundred forty".