690427 has 2 divisors, whose sum is σ = 690428. Its totient is φ = 690426.

The previous prime is 690419. The next prime is 690433. The reversal of 690427 is 724096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690427 - 2³ = 690419 is a prime.

It is a Chen prime.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 690395 and 690404.

It is not a weakly prime, because it can be changed into another prime (690407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345213 + 345214.

It is an arithmetic number, because the mean of its divisors is an integer number (345214).

2⁶⁹⁰⁴²⁷ is an apocalyptic number.

690427 is a deficient number, since it is larger than the sum of its proper divisors (1).

690427 is an equidigital number, since it uses as much as digits as its factorization.

690427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 690427 is about 830.9193703363. The cubic root of 690427 is about 88.3837835299.

The spelling of 690427 in words is "six hundred ninety thousand, four hundred twenty-seven".