690338387 has 2 divisors, whose sum is σ = 690338388. Its totient is φ = 690338386.

The previous prime is 690338347. The next prime is 690338401. The reversal of 690338387 is 783833096.

690338387 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 is a cyclic number.

It is not a de Polignac number, because 690338387 - 2⁶ = 690338323 is a prime.

It is not a weakly prime, because it can be changed into another prime (690338347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345169193 + 345169194.

It is an arithmetic number, because the mean of its divisors is an integer number (345169194).

Almost surely, 2^690338387 is an apocalyptic number.

690338387 is a deficient number, since it is larger than the sum of its proper divisors (1).

690338387 is an equidigital number, since it uses as much as digits as its factorization.

690338387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 47.

The square root of 690338387 is about 26274.2913700827. The cubic root of 690338387 is about 883.8000215627.

The spelling of 690338387 in words is "six hundred ninety million, three hundred thirty-eight thousand, three hundred eighty-seven".