1399771 has 4 divisors (see below), whose sum is σ = 1406272. Its totient is φ = 1393272.

The previous prime is 1399751. The next prime is 1399777. The reversal of 1399771 is 1779931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1399771 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 1399771.

It is not an unprimeable number, because it can be changed into a prime (1399777) 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, 2916 + ... + 3361.

It is an arithmetic number, because the mean of its divisors is an integer number (351568).

2^1399771 is an apocalyptic number.

1399771 is a deficient number, since it is larger than the sum of its proper divisors (6501).

1399771 is an equidigital number, since it uses as much as digits as its factorization.

1399771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6500.

The product of its digits is 11907, while the sum is 37.

The square root of 1399771 is about 1183.1191825002. The cubic root of 1399771 is about 111.8627943573.

The spelling of 1399771 in words is "one million, three hundred ninety-nine thousand, seven hundred seventy-one".