780000421 has 4 divisors (see below), whose sum is σ = 783960012. Its totient is φ = 776040832.

The previous prime is 780000383. The next prime is 780000427. The reversal of 780000421 is 124000087.

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 568297921 + 211702500 = 23839^2 + 14550^2 .

It is a cyclic number.

It is not a de Polignac number, because 780000421 - 2¹⁵ = 779967653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 780000392 and 780000401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780000427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1979500 + ... + 1979893.

It is an arithmetic number, because the mean of its divisors is an integer number (195990003).

Almost surely, 2^780000421 is an apocalyptic number.

It is an amenable number.

780000421 is a deficient number, since it is larger than the sum of its proper divisors (3959591).

780000421 is a wasteful number, since it uses less digits than its factorization.

780000421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959590.

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

The square root of 780000421 is about 27928.4876246459. The cubic root of 780000421 is about 920.5165738658.

The spelling of 780000421 in words is "seven hundred eighty million, four hundred twenty-one", and thus it is an aban number.