1375641 has 12 divisors (see below), whose sum is σ = 1997268. Its totient is φ = 912384.

The previous prime is 1375639. The next prime is 1375669. The reversal of 1375641 is 1465731.

1375641 is a `hidden beast` number, since 13 + 7 + 5 + 641 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 335241 + 1040400 = 579^2 + 1020^2 .

It is not a de Polignac number, because 1375641 - 2¹ = 1375639 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

1375641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1375601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2961 + ... + 3393.

It is an arithmetic number, because the mean of its divisors is an integer number (166439).

2^1375641 is an apocalyptic number.

It is an amenable number.

1375641 is a deficient number, since it is larger than the sum of its proper divisors (621627).

1375641 is a wasteful number, since it uses less digits than its factorization.

1375641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792 (or 789 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 1375641 is about 1172.8772314271. The cubic root of 1375641 is about 111.2162814954.

It can be divided in two parts, 1375 and 641, that added together give a triangular number (2016 = T₆₃).

The spelling of 1375641 in words is "one million, three hundred seventy-five thousand, six hundred forty-one".