1340644 has 6 divisors (see below), whose sum is σ = 2346134. Its totient is φ = 670320.

The previous prime is 1340639. The next prime is 1340653. The reversal of 1340644 is 4460431.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1102500 + 238144 = 1050^2 + 488^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167577 + ... + 167584.

2^1340644 is an apocalyptic number.

It is an amenable number.

1340644 is a deficient number, since it is larger than the sum of its proper divisors (1005490).

1340644 is a wasteful number, since it uses less digits than its factorization.

1340644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335165 (or 335163 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1340644 is about 1157.8618224987. The cubic root of 1340644 is about 110.2650358365.

The spelling of 1340644 in words is "one million, three hundred forty thousand, six hundred forty-four".