807421 has 4 divisors (see below), whose sum is σ = 809244. Its totient is φ = 805600.

The previous prime is 807419. The next prime is 807427. The reversal of 807421 is 124708.

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

It can be written as a sum of positive squares in 2 ways, for example, as 184900 + 622521 = 430^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 807421 - 2¹ = 807419 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 807392 and 807401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (807427) 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, 231 + ... + 1291.

It is an arithmetic number, because the mean of its divisors is an integer number (202311).

2⁸⁰⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

807421 is a deficient number, since it is larger than the sum of its proper divisors (1823).

807421 is a wasteful number, since it uses less digits than its factorization.

807421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 807421 is about 898.5660799296. The cubic root of 807421 is about 93.1179372449.

The spelling of 807421 in words is "eight hundred seven thousand, four hundred twenty-one".