1399561 has 4 divisors (see below), whose sum is σ = 1404052. Its totient is φ = 1395072.

The previous prime is 1399553. The next prime is 1399577. The reversal of 1399561 is 1659931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 145161 + 1254400 = 381^2 + 1120^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399561 - 2³ = 1399553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1399261) 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, 1740 + ... + 2413.

It is an arithmetic number, because the mean of its divisors is an integer number (351013).

2^1399561 is an apocalyptic number.

It is an amenable number.

1399561 is a deficient number, since it is larger than the sum of its proper divisors (4491).

1399561 is an equidigital number, since it uses as much as digits as its factorization.

1399561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4490.

The product of its digits is 7290, while the sum is 34.

The square root of 1399561 is about 1183.0304307160. The cubic root of 1399561 is about 111.8572000227.

The spelling of 1399561 in words is "one million, three hundred ninety-nine thousand, five hundred sixty-one".