690543 has 24 divisors (see below), whose sum is σ = 1161888. Its totient is φ = 387072.

The previous prime is 690541. The next prime is 690553. The reversal of 690543 is 345096.

It is a happy number.

It is not a de Polignac number, because 690543 - 2¹ = 690541 is a prime.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690543.

It is not an unprimeable number, because it can be changed into a prime (690541) 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 23 ways as a sum of consecutive naturals, for example, 6055 + ... + 6167.

It is an arithmetic number, because the mean of its divisors is an integer number (48412).

2⁶⁹⁰⁵⁴³ is an apocalyptic number.

690543 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

690543 is a deficient number, since it is larger than the sum of its proper divisors (471345).

690543 is a wasteful number, since it uses less digits than its factorization.

690543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 690543 is about 830.9891696045. The cubic root of 690543 is about 88.3887330972.

The spelling of 690543 in words is "six hundred ninety thousand, five hundred forty-three".