1381520 has 40 divisors (see below), whose sum is σ = 3672384. Its totient is φ = 473472.

The previous prime is 1381519. The next prime is 1381529. The reversal of 1381520 is 251831.

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

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1381492 and 1381501.

It is not an unprimeable number, because it can be changed into a prime (1381529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674 + ... + 1793.

2^1381520 is an apocalyptic number.

1381520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1381520 is an abundant number, since it is smaller than the sum of its proper divisors (2290864).

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

1381520 is a wasteful number, since it uses less digits than its factorization.

1381520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487 (or 2481 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1381520 is about 1175.3807893615. The cubic root of 1381520 is about 111.3744892683.

The spelling of 1381520 in words is "one million, three hundred eighty-one thousand, five hundred twenty".