1242457 has 2 divisors, whose sum is σ = 1242458. Its totient is φ = 1242456.

The previous prime is 1242421. The next prime is 1242487. The reversal of 1242457 is 7542421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1157776 + 84681 = 1076^2 + 291^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242457 - 2¹⁹ = 718169 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621228 + 621229.

It is an arithmetic number, because the mean of its divisors is an integer number (621229).

2^1242457 is an apocalyptic number.

It is an amenable number.

1242457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242457 is an equidigital number, since it uses as much as digits as its factorization.

1242457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 25.

The square root of 1242457 is about 1114.6555521774. The cubic root of 1242457 is about 107.5046185144.

Adding to 1242457 its reverse (7542421), we get a palindrome (8784878).

The spelling of 1242457 in words is "one million, two hundred forty-two thousand, four hundred fifty-seven".