1340649 has 6 divisors (see below), whose sum is σ = 1936506. Its totient is φ = 893760.

The previous prime is 1340639. The next prime is 1340653. The reversal of 1340649 is 9460431.

1340649 is a `hidden beast` number, since 13 + 4 + 0 + 649 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1065024 + 275625 = 1032^2 + 525^2 .

It is not a de Polignac number, because 1340649 - 2⁵ = 1340617 is a prime.

1340649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1340639) 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 5 ways as a sum of consecutive naturals, for example, 74472 + ... + 74489.

It is an arithmetic number, because the mean of its divisors is an integer number (322751).

2^1340649 is an apocalyptic number.

It is an amenable number.

1340649 is a deficient number, since it is larger than the sum of its proper divisors (595857).

1340649 is a wasteful number, since it uses less digits than its factorization.

1340649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148967 (or 148964 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1340649 is about 1157.8639816490. The cubic root of 1340649 is about 110.2651729160.

The spelling of 1340649 in words is "one million, three hundred forty thousand, six hundred forty-nine".