1251859 has 8 divisors (see below), whose sum is σ = 1464320. Its totient is φ = 1047816.

The previous prime is 1251857. The next prime is 1251869. The reversal of 1251859 is 9581521.

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

It is not a de Polignac number, because 1251859 - 2¹ = 1251857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1251859.

It is not an unprimeable number, because it can be changed into a prime (1251851) 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, 1779 + ... + 2380.

It is an arithmetic number, because the mean of its divisors is an integer number (183040).

2^1251859 is an apocalyptic number.

1251859 is a deficient number, since it is larger than the sum of its proper divisors (212461).

1251859 is an equidigital number, since it uses as much as digits as its factorization.

1251859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209.

The product of its digits is 3600, while the sum is 31.

The square root of 1251859 is about 1118.8650499502. The cubic root of 1251859 is about 107.7751093052.

The spelling of 1251859 in words is "one million, two hundred fifty-one thousand, eight hundred fifty-nine".