670399 has 2 divisors, whose sum is σ = 670400. Its totient is φ = 670398.

The previous prime is 670379. The next prime is 670409. The reversal of 670399 is 993076.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 670399 - 2⁹ = 669887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670349) 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, 335199 + 335200.

It is an arithmetic number, because the mean of its divisors is an integer number (335200).

2⁶⁷⁰³⁹⁹ is an apocalyptic number.

670399 is a deficient number, since it is larger than the sum of its proper divisors (1).

670399 is an equidigital number, since it uses as much as digits as its factorization.

670399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 670399 is about 818.7789689532. The cubic root of 670399 is about 87.5207678595.

It can be divided in two parts, 67039 and 9, that multiplied together give a triangular number (603351 = T₁₀₉₈).

The spelling of 670399 in words is "six hundred seventy thousand, three hundred ninety-nine".