521402 has 8 divisors (see below), whose sum is σ = 893856. Its totient is φ = 223452.

The previous prime is 521401. The next prime is 521429. The reversal of 521402 is 204125.

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

It is a Harshad number since it is a multiple of its sum of digits (14), and also a Moran number because the ratio is a prime number: 37243 = 521402 / (5 + 2 + 1 + 4 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (521401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18608 + ... + 18635.

It is an arithmetic number, because the mean of its divisors is an integer number (111732).

2⁵²¹⁴⁰² is an apocalyptic number.

521402 is a deficient number, since it is larger than the sum of its proper divisors (372454).

521402 is a wasteful number, since it uses less digits than its factorization.

521402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37252.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 521402 is about 722.0817128276. The cubic root of 521402 is about 80.4867202867.

Adding to 521402 its reverse (204125), we get a palindrome (725527).

The spelling of 521402 in words is "five hundred twenty-one thousand, four hundred two".