1340252257 has 2 divisors, whose sum is σ = 1340252258. Its totient is φ = 1340252256.

The previous prime is 1340252189. The next prime is 1340252269. The reversal of 1340252257 is 7522520431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1267644816 + 72607441 = 35604^2 + 8521^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340252257 - 2⁷ = 1340252129 is a prime.

It is a super-2 number, since 2×1340252257² = 3592552224787188098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1340252857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670126128 + 670126129.

It is an arithmetic number, because the mean of its divisors is an integer number (670126129).

Almost surely, 2^1340252257 is an apocalyptic number.

It is an amenable number.

1340252257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340252257 is an equidigital number, since it uses as much as digits as its factorization.

1340252257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 1340252257 is about 36609.4558413533. The cubic root of 1340252257 is about 1102.5429478867.

Adding to 1340252257 its reverse (7522520431), we get a palindrome (8862772688).

The spelling of 1340252257 in words is "one billion, three hundred forty million, two hundred fifty-two thousand, two hundred fifty-seven".