521400382 has 4 divisors (see below), whose sum is σ = 782100576. Its totient is φ = 260700190.

The previous prime is 521400371. The next prime is 521400389. The reversal of 521400382 is 283004125.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521400389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130350094 + ... + 130350097.

It is an arithmetic number, because the mean of its divisors is an integer number (195525144).

Almost surely, 2^521400382 is an apocalyptic number.

521400382 is a deficient number, since it is larger than the sum of its proper divisors (260700194).

521400382 is a wasteful number, since it uses less digits than its factorization.

521400382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260700193.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 521400382 is about 22834.1932636124. The cubic root of 521400382 is about 804.8663703190.

The spelling of 521400382 in words is "five hundred twenty-one million, four hundred thousand, three hundred eighty-two".