1381975 has 24 divisors (see below), whose sum is σ = 2008800. Its totient is φ = 923520.

The previous prime is 1381973. The next prime is 1381979. The reversal of 1381975 is 5791831.

It is a happy number.

It is not a de Polignac number, because 1381975 - 2¹ = 1381973 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

1381975 is a lucky number.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1381975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9201 + ... + 9349.

It is an arithmetic number, because the mean of its divisors is an integer number (83700).

2^1381975 is an apocalyptic number.

1381975 is a deficient number, since it is larger than the sum of its proper divisors (626825).

1381975 is a wasteful number, since it uses less digits than its factorization.

1381975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 214 counting only the distinct ones).

The product of its digits is 7560, while the sum is 34.

The square root of 1381975 is about 1175.5743277224. The cubic root of 1381975 is about 111.3867148919.

The spelling of 1381975 in words is "one million, three hundred eighty-one thousand, nine hundred seventy-five".