1215457 has 2 divisors, whose sum is σ = 1215458. Its totient is φ = 1215456.

The previous prime is 1215451. The next prime is 1215463. The reversal of 1215457 is 7545121.

It is a balanced prime because it is at equal distance from previous prime (1215451) and next prime (1215463).

It can be written as a sum of positive squares in only one way, i.e., 1175056 + 40401 = 1084^2 + 201^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215457 - 2⁷ = 1215329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607728 + 607729.

It is an arithmetic number, because the mean of its divisors is an integer number (607729).

2^1215457 is an apocalyptic number.

It is an amenable number.

1215457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215457 is an equidigital number, since it uses as much as digits as its factorization.

1215457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 25.

The square root of 1215457 is about 1102.4776641728. The cubic root of 1215457 is about 106.7201760605.

The spelling of 1215457 in words is "one million, two hundred fifteen thousand, four hundred fifty-seven".