1258921 has 8 divisors (see below), whose sum is σ = 1336320. Its totient is φ = 1182672.

The previous prime is 1258903. The next prime is 1258927. The reversal of 1258921 is 1298521.

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 1258921 - 2⁵ = 1258889 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

1258921 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1258921.

It is not an unprimeable number, because it can be changed into a prime (1258927) 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, 3096 + ... + 3478.

It is an arithmetic number, because the mean of its divisors is an integer number (167040).

2^1258921 is an apocalyptic number.

It is an amenable number.

1258921 is a deficient number, since it is larger than the sum of its proper divisors (77399).

1258921 is a wasteful number, since it uses less digits than its factorization.

1258921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575.

The product of its digits is 1440, while the sum is 28.

The square root of 1258921 is about 1122.0164882924. The cubic root of 1258921 is about 107.9773901000.

The spelling of 1258921 in words is "one million, two hundred fifty-eight thousand, nine hundred twenty-one".