1257123 has 8 divisors (see below), whose sum is σ = 1915648. Its totient is φ = 718344.

The previous prime is 1257119. The next prime is 1257131. The reversal of 1257123 is 3217521.

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

It is not a de Polignac number, because 1257123 - 2² = 1257119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 59863 = 1257123 / (1 + 2 + 5 + 7 + 1 + 2 + 3).

It is a self number, because there is not a number n which added to its sum of digits gives 1257123.

It is not an unprimeable number, because it can be changed into a prime (1257103) 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 7 ways as a sum of consecutive naturals, for example, 29911 + ... + 29952.

It is an arithmetic number, because the mean of its divisors is an integer number (239456).

2^1257123 is an apocalyptic number.

1257123 is a deficient number, since it is larger than the sum of its proper divisors (658525).

1257123 is an equidigital number, since it uses as much as digits as its factorization.

1257123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59873.

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

The square root of 1257123 is about 1121.2149660079. The cubic root of 1257123 is about 107.9259609141.

The spelling of 1257123 in words is "one million, two hundred fifty-seven thousand, one hundred twenty-three".