699649 has 2 divisors, whose sum is σ = 699650. Its totient is φ = 699648.

The previous prime is 699641. The next prime is 699697. The reversal of 699649 is 946996.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651249 + 48400 = 807^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 699649 - 2³ = 699641 is a prime.

It is not a weakly prime, because it can be changed into another prime (699641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349824 + 349825.

It is an arithmetic number, because the mean of its divisors is an integer number (349825).

2⁶⁹⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

699649 is a deficient number, since it is larger than the sum of its proper divisors (1).

699649 is an equidigital number, since it uses as much as digits as its factorization.

699649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 43.

The square root of 699649 is about 836.4502376113. The cubic root of 699649 is about 88.7755570119.

The spelling of 699649 in words is "six hundred ninety-nine thousand, six hundred forty-nine".