1216357 has 4 divisors (see below), whose sum is σ = 1219680. Its totient is φ = 1213036.

The previous prime is 1216351. The next prime is 1216373. The reversal of 1216357 is 7536121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7536121 = 47 ⋅160343.

It is a cyclic number.

It is not a de Polignac number, because 1216357 - 2³ = 1216349 is a prime.

It is a Duffinian number.

1216357 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1033 + ... + 1870.

It is an arithmetic number, because the mean of its divisors is an integer number (304920).

2^1216357 is an apocalyptic number.

It is an amenable number.

1216357 is a deficient number, since it is larger than the sum of its proper divisors (3323).

1216357 is an equidigital number, since it uses as much as digits as its factorization.

1216357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322.

The product of its digits is 1260, while the sum is 25.

The square root of 1216357 is about 1102.8857601765. The cubic root of 1216357 is about 106.7465103149.

The spelling of 1216357 in words is "one million, two hundred sixteen thousand, three hundred fifty-seven".