523990 has 16 divisors (see below), whose sum is σ = 959760. Its totient is φ = 205920.

The previous prime is 523987. The next prime is 523997. The reversal of 523990 is 99325.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181 + ... + 1039.

It is an arithmetic number, because the mean of its divisors is an integer number (59985).

2⁵²³⁹⁹⁰ is an apocalyptic number.

523990 is a deficient number, since it is larger than the sum of its proper divisors (435770).

523990 is a wasteful number, since it uses less digits than its factorization.

523990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 523990 is about 723.8715355641. The cubic root of 523990 is about 80.6196669349.

It can be divided in two parts, 5239 and 90, that added together give a square (5329 = 73²).

The spelling of 523990 in words is "five hundred twenty-three thousand, nine hundred ninety".