1320775 has 12 divisors (see below), whose sum is σ = 1709712. Its totient is φ = 1010240.
The previous prime is 1320773. The next prime is 1320791. The reversal of 1320775 is 5770231.
It is not a de Polignac number, because 1320775 - 21 = 1320773 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (25).
It is a Duffinian number.
1320775 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1320773) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 574 + ... + 1723.
It is an arithmetic number, because the mean of its divisors is an integer number (142476).
21320775 is an apocalyptic number.
1320775 is the 575-th decagonal number.
1320775 is a deficient number, since it is larger than the sum of its proper divisors (388937).
1320775 is a wasteful number, since it uses less digits than its factorization.
1320775 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2330 (or 2325 counting only the distinct ones).
The product of its (nonzero) digits is 1470, while the sum is 25.
The square root of 1320775 is about 1149.2497552752. The cubic root of 1320775 is about 109.7175951570.
The spelling of 1320775 in words is "one million, three hundred twenty thousand, seven hundred seventy-five".
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