1395721 has 4 divisors (see below), whose sum is σ = 1469200. Its totient is φ = 1322244.

The previous prime is 1395697. The next prime is 1395739. The reversal of 1395721 is 1275931.

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 1395721 - 2⁷ = 1395593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1395721.

It is not an unprimeable number, because it can be changed into a prime (1395781) 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, 36711 + ... + 36748.

It is an arithmetic number, because the mean of its divisors is an integer number (367300).

2^1395721 is an apocalyptic number.

It is an amenable number.

1395721 is a deficient number, since it is larger than the sum of its proper divisors (73479).

1395721 is an equidigital number, since it uses as much as digits as its factorization.

1395721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73478.

The product of its digits is 1890, while the sum is 28.

The square root of 1395721 is about 1181.4063653121. The cubic root of 1395721 is about 111.7548047989.

It can be divided in two parts, 1395 and 721, that added together give a square (2116 = 46²).

The spelling of 1395721 in words is "one million, three hundred ninety-five thousand, seven hundred twenty-one".