1421858 has 4 divisors (see below), whose sum is σ = 2132790. Its totient is φ = 710928.

The previous prime is 1421857. The next prime is 1421867. The reversal of 1421858 is 8581241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 833569 + 588289 = 913^2 + 767^2 .

It is an Ulam number.

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 1421858.

It is not an unprimeable number, because it can be changed into a prime (1421857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 355463 + ... + 355466.

2^1421858 is an apocalyptic number.

1421858 is a deficient number, since it is larger than the sum of its proper divisors (710932).

1421858 is an equidigital number, since it uses as much as digits as its factorization.

1421858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710931.

The product of its digits is 2560, while the sum is 29.

The square root of 1421858 is about 1192.4168734130. The cubic root of 1421858 is about 112.4480879836.

The spelling of 1421858 in words is "one million, four hundred twenty-one thousand, eight hundred fifty-eight".