783421 has 2 divisors, whose sum is σ = 783422. Its totient is φ = 783420.

The previous prime is 783413. The next prime is 783473. The reversal of 783421 is 124387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 783225 + 196 = 885^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 783421 - 2³ = 783413 is a prime.

It is a super-2 number, since 2×783421² = 1227496926482, which contains 22 as substring.

783421 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (783121) 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 as a sum of consecutive naturals, namely, 391710 + 391711.

It is an arithmetic number, because the mean of its divisors is an integer number (391711).

2⁷⁸³⁴²¹ is an apocalyptic number.

It is an amenable number.

783421 is a deficient number, since it is larger than the sum of its proper divisors (1).

783421 is an equidigital number, since it uses as much as digits as its factorization.

783421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 25.

The square root of 783421 is about 885.1107275364. The cubic root of 783421 is about 92.1860209090.

The spelling of 783421 in words is "seven hundred eighty-three thousand, four hundred twenty-one".