1399634 has 4 divisors (see below), whose sum is σ = 2099454. Its totient is φ = 699816.

The previous prime is 1399633. The next prime is 1399639. The reversal of 1399634 is 4369931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4369931 = 23 ⋅189997.

It can be written as a sum of positive squares in only one way, i.e., 1329409 + 70225 = 1153^2 + 265^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1399594 and 1399603.

It is not an unprimeable number, because it can be changed into a prime (1399633) 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, 349907 + ... + 349910.

2^1399634 is an apocalyptic number.

1399634 is a deficient number, since it is larger than the sum of its proper divisors (699820).

1399634 is an equidigital number, since it uses as much as digits as its factorization.

1399634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699819.

The product of its digits is 17496, while the sum is 35.

The square root of 1399634 is about 1183.0612832816. The cubic root of 1399634 is about 111.8591447834.

The spelling of 1399634 in words is "one million, three hundred ninety-nine thousand, six hundred thirty-four".