80405421 has 4 divisors (see below), whose sum is σ = 107207232. Its totient is φ = 53603612.

The previous prime is 80405389. The next prime is 80405431. The reversal of 80405421 is 12450408.

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 a cyclic number.

It is not a de Polignac number, because 80405421 - 2⁵ = 80405389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80405391 and 80405400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80405431) 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, 13400901 + ... + 13400906.

It is an arithmetic number, because the mean of its divisors is an integer number (26801808).

Almost surely, 2^80405421 is an apocalyptic number.

It is an amenable number.

80405421 is a deficient number, since it is larger than the sum of its proper divisors (26801811).

80405421 is a wasteful number, since it uses less digits than its factorization.

80405421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26801810.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 80405421 is about 8966.9069918228. The cubic root of 80405421 is about 431.6135894417.

Adding to 80405421 its reverse (12450408), we get a palindrome (92855829).

The spelling of 80405421 in words is "eighty million, four hundred five thousand, four hundred twenty-one".