1222657 has 16 divisors (see below), whose sum is σ = 1399680. Its totient is φ = 1061632.

The previous prime is 1222651. The next prime is 1222667. The reversal of 1222657 is 7562221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222657 is a prime.

It is a d-powerful number, because it can be written as 1 + 2² + 2⁸ + 2¹³ + 6² + 5⁸ + 7⁷ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20694 + ... + 20752.

It is an arithmetic number, because the mean of its divisors is an integer number (87480).

It is a Proth number, since it is equal to 597 ⋅ 2¹¹ + 1 and 597 < 2¹¹.

2^1222657 is an apocalyptic number.

1222657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1222657 is a deficient number, since it is larger than the sum of its proper divisors (177023).

1222657 is a wasteful number, since it uses less digits than its factorization.

1222657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152.

The product of its digits is 1680, while the sum is 25.

The square root of 1222657 is about 1105.7382149496. The cubic root of 1222657 is about 106.9304873573.

Adding to 1222657 its reverse (7562221), we get a palindrome (8784878).

The spelling of 1222657 in words is "one million, two hundred twenty-two thousand, six hundred fifty-seven".