1399522 has 4 divisors (see below), whose sum is σ = 2099286. Its totient is φ = 699760.

The previous prime is 1399513. The next prime is 1399529. The reversal of 1399522 is 2259931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2259931 = 31 ⋅72901.

It can be written as a sum of positive squares in only one way, i.e., 1394761 + 4761 = 1181^2 + 69^2 .

It is an Ulam number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1399529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349879 + ... + 349882.

2^1399522 is an apocalyptic number.

1399522 is a deficient number, since it is larger than the sum of its proper divisors (699764).

1399522 is an equidigital number, since it uses as much as digits as its factorization.

1399522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699763.

The product of its digits is 4860, while the sum is 31.

The square root of 1399522 is about 1183.0139475087. The cubic root of 1399522 is about 111.8561610133.

The spelling of 1399522 in words is "one million, three hundred ninety-nine thousand, five hundred twenty-two".