679421 has 4 divisors (see below), whose sum is σ = 715200. Its totient is φ = 643644.

The previous prime is 679417. The next prime is 679423. The reversal of 679421 is 124976.

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 not a de Polignac number, because 679421 - 2² = 679417 is a prime.

It is a super-2 number, since 2×679421² = 923225790482, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6² + 7⁵ + 4³ + 9⁶ + 2¹⁷ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17861 + ... + 17898.

It is an arithmetic number, because the mean of its divisors is an integer number (178800).

2⁶⁷⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

679421 is a deficient number, since it is larger than the sum of its proper divisors (35779).

679421 is a wasteful number, since it uses less digits than its factorization.

679421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35778.

The product of its digits is 3024, while the sum is 29.

The square root of 679421 is about 824.2699800429. The cubic root of 679421 is about 87.9116278817.

The spelling of 679421 in words is "six hundred seventy-nine thousand, four hundred twenty-one".