1369649 has 4 divisors (see below), whose sum is σ = 1375860. Its totient is φ = 1363440.

The previous prime is 1369619. The next prime is 1369651. The reversal of 1369649 is 9469631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9469631 = 29 ⋅326539.

It can be written as a sum of positive squares in 2 ways, for example, as 616225 + 753424 = 785^2 + 868^2 .

It is a cyclic number.

It is not a de Polignac number, because 1369649 - 2⁸ = 1369393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1369619) 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, 2762 + ... + 3219.

It is an arithmetic number, because the mean of its divisors is an integer number (343965).

2^1369649 is an apocalyptic number.

It is an amenable number.

1369649 is a deficient number, since it is larger than the sum of its proper divisors (6211).

1369649 is an equidigital number, since it uses as much as digits as its factorization.

1369649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210.

The product of its digits is 34992, while the sum is 38.

The square root of 1369649 is about 1170.3200416980. The cubic root of 1369649 is about 111.0545683052.

The spelling of 1369649 in words is "one million, three hundred sixty-nine thousand, six hundred forty-nine".