521890 has 8 divisors (see below), whose sum is σ = 939420. Its totient is φ = 208752.

The previous prime is 521887. The next prime is 521897. The reversal of 521890 is 98125.

It can be written as a sum of positive squares in 2 ways, for example, as 426409 + 95481 = 653^2 + 309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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

It is not an unprimeable number, because it can be changed into a prime (521897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26085 + ... + 26104.

2⁵²¹⁸⁹⁰ is an apocalyptic number.

521890 is a deficient number, since it is larger than the sum of its proper divisors (417530).

521890 is a wasteful number, since it uses less digits than its factorization.

521890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52196.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 521890 is about 722.4195456935. The cubic root of 521890 is about 80.5118226531.

The spelling of 521890 in words is "five hundred twenty-one thousand, eight hundred ninety".