1258861 has 8 divisors (see below), whose sum is σ = 1320480. Its totient is φ = 1198512.

The previous prime is 1258847. The next prime is 1258871. The reversal of 1258861 is 1688521.

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

It is not a de Polignac number, because 1258861 - 2⁹ = 1258349 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1258811) 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, 2146 + ... + 2668.

It is an arithmetic number, because the mean of its divisors is an integer number (165060).

2^1258861 is an apocalyptic number.

It is an amenable number.

1258861 is a deficient number, since it is larger than the sum of its proper divisors (61619).

1258861 is an equidigital number, since it uses as much as digits as its factorization.

1258861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635.

The product of its digits is 3840, while the sum is 31.

The square root of 1258861 is about 1121.9897503988. The cubic root of 1258861 is about 107.9756746770.

The spelling of 1258861 in words is "one million, two hundred fifty-eight thousand, eight hundred sixty-one".