693421 has 2 divisors, whose sum is σ = 693422. Its totient is φ = 693420.

The previous prime is 693409. The next prime is 693431. The reversal of 693421 is 124396.

693421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617796 + 75625 = 786^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 693421 - 2¹⁷ = 562349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (693401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346710 + 346711.

It is an arithmetic number, because the mean of its divisors is an integer number (346711).

2⁶⁹³⁴²¹ is an apocalyptic number.

It is an amenable number.

693421 is a deficient number, since it is larger than the sum of its proper divisors (1).

693421 is an equidigital number, since it uses as much as digits as its factorization.

693421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 693421 is about 832.7190402531. The cubic root of 693421 is about 88.5113564964.

Subtracting from 693421 its sum of digits (25), we obtain a palindrome (693396).

The spelling of 693421 in words is "six hundred ninety-three thousand, four hundred twenty-one".