1369639 has 4 divisors (see below), whose sum is σ = 1450224. Its totient is φ = 1289056.

The previous prime is 1369619. The next prime is 1369651. The reversal of 1369639 is 9369631.

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

It is a cyclic number.

It is not a de Polignac number, because 1369639 - 2⁵ = 1369607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1369598 and 1369607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1369619) 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 in 3 ways as a sum of consecutive naturals, for example, 40267 + ... + 40300.

It is an arithmetic number, because the mean of its divisors is an integer number (362556).

2^1369639 is an apocalyptic number.

1369639 is a deficient number, since it is larger than the sum of its proper divisors (80585).

1369639 is an equidigital number, since it uses as much as digits as its factorization.

1369639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80584.

The product of its digits is 26244, while the sum is 37.

The square root of 1369639 is about 1170.3157693546. The cubic root of 1369639 is about 111.0542980295.

The spelling of 1369639 in words is "one million, three hundred sixty-nine thousand, six hundred thirty-nine".