690105 has 16 divisors (see below), whose sum is σ = 1189440. Its totient is φ = 339648.

The previous prime is 690103. The next prime is 690119. The reversal of 690105 is 501096.

It is not a de Polignac number, because 690105 - 2¹ = 690103 is a prime.

It is a super-2 number, since 2×690105² = 952489822050, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (690103) 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 in 15 ways as a sum of consecutive naturals, for example, 1575 + ... + 1964.

It is an arithmetic number, because the mean of its divisors is an integer number (74340).

2⁶⁹⁰¹⁰⁵ is an apocalyptic number.

690105 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

690105 is a deficient number, since it is larger than the sum of its proper divisors (499335).

690105 is a wasteful number, since it uses less digits than its factorization.

690105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3560.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 690105 is about 830.7255864604. The cubic root of 690105 is about 88.3700413077.

The spelling of 690105 in words is "six hundred ninety thousand, one hundred five".