521415340 has 12 divisors (see below), whose sum is σ = 1094972256. Its totient is φ = 208566128.

The previous prime is 521415337. The next prime is 521415353. The reversal of 521415340 is 43514125.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13035364 + ... + 13035403.

It is an arithmetic number, because the mean of its divisors is an integer number (91247688).

Almost surely, 2^521415340 is an apocalyptic number.

It is an amenable number.

521415340 is an abundant number, since it is smaller than the sum of its proper divisors (573556916).

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

521415340 is a wasteful number, since it uses less digits than its factorization.

521415340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26070776 (or 26070774 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 521415340 is about 22834.5207963732. The cubic root of 521415340 is about 804.8740669481.

Adding to 521415340 its reverse (43514125), we get a palindrome (564929465).

The spelling of 521415340 in words is "five hundred twenty-one million, four hundred fifteen thousand, three hundred forty".