1257213 has 8 divisors (see below), whose sum is σ = 1708128. Its totient is φ = 822224.

The previous prime is 1257209. The next prime is 1257229. The reversal of 1257213 is 3127521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1257213 - 2² = 1257209 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1257213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3795 + ... + 4112.

It is an arithmetic number, because the mean of its divisors is an integer number (213516).

2^1257213 is an apocalyptic number.

It is an amenable number.

1257213 is a deficient number, since it is larger than the sum of its proper divisors (450915).

1257213 is an equidigital number, since it uses as much as digits as its factorization.

1257213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7963.

The product of its digits is 420, while the sum is 21.

The square root of 1257213 is about 1121.2551003228. The cubic root of 1257213 is about 107.9285363992.

The spelling of 1257213 in words is "one million, two hundred fifty-seven thousand, two hundred thirteen".