521400124 has 12 divisors (see below), whose sum is σ = 1042800304. Its totient is φ = 223457184.

The previous prime is 521400119. The next prime is 521400127. The reversal of 521400124 is 421004125.

521400124 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521400127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9310689 + ... + 9310744.

Almost surely, 2^521400124 is an apocalyptic number.

It is an amenable number.

521400124 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521400124 is a wasteful number, since it uses less digits than its factorization.

521400124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18621444 (or 18621442 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 521400124 is about 22834.1876141894. The cubic root of 521400124 is about 804.8662375640.

Adding to 521400124 its reverse (421004125), we get a palindrome (942404249).

The spelling of 521400124 in words is "five hundred twenty-one million, four hundred thousand, one hundred twenty-four".