1340557 has 2 divisors, whose sum is σ = 1340558. Its totient is φ = 1340556.

The previous prime is 1340527. The next prime is 1340561. The reversal of 1340557 is 7550431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1042441 + 298116 = 1021^2 + 546^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340557 is a prime.

It is equal to p₁₀₂₈₉₅ and since 1340557 and 102895 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670278 + 670279.

It is an arithmetic number, because the mean of its divisors is an integer number (670279).

2^1340557 is an apocalyptic number.

It is an amenable number.

1340557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340557 is an equidigital number, since it uses as much as digits as its factorization.

1340557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 1340557 is about 1157.8242526394. The cubic root of 1340557 is about 110.2626505983.

Adding to 1340557 its reverse (7550431), we get a palindrome (8890988).

The spelling of 1340557 in words is "one million, three hundred forty thousand, five hundred fifty-seven".