1395521 has 4 divisors (see below), whose sum is σ = 1401600. Its totient is φ = 1389444.

The previous prime is 1395491. The next prime is 1395523. The reversal of 1395521 is 1255931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1395521 - 2¹⁴ = 1379137 is a prime.

It is a super-2 number, since 2×1395521² = 3894957722882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1395523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2681 + ... + 3158.

It is an arithmetic number, because the mean of its divisors is an integer number (350400).

2^1395521 is an apocalyptic number.

It is an amenable number.

1395521 is a deficient number, since it is larger than the sum of its proper divisors (6079).

1395521 is an equidigital number, since it uses as much as digits as its factorization.

1395521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6078.

The product of its digits is 1350, while the sum is 26.

The square root of 1395521 is about 1181.3217173996. The cubic root of 1395521 is about 111.7494665714.

The spelling of 1395521 in words is "one million, three hundred ninety-five thousand, five hundred twenty-one".