899421 has 4 divisors (see below), whose sum is σ = 1199232. Its totient is φ = 599612.

The previous prime is 899413. The next prime is 899429. The reversal of 899421 is 124998.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (899413) and next prime (899429).

It is a cyclic number.

It is not a de Polignac number, because 899421 - 2³ = 899413 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149901 + ... + 149906.

It is an arithmetic number, because the mean of its divisors is an integer number (299808).

2⁸⁹⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

899421 is a deficient number, since it is larger than the sum of its proper divisors (299811).

899421 is a wasteful number, since it uses less digits than its factorization.

899421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299810.

The product of its digits is 5184, while the sum is 33.

The square root of 899421 is about 948.3780891606. The cubic root of 899421 is about 96.5282296356.

The spelling of 899421 in words is "eight hundred ninety-nine thousand, four hundred twenty-one".