521141240 has 16 divisors (see below), whose sum is σ = 1172567880. Its totient is φ = 208456480.

The previous prime is 521141237. The next prime is 521141249. The reversal of 521141240 is 42141125.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521141249) 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, 6514226 + ... + 6514305.

Almost surely, 2^521141240 is an apocalyptic number.

It is an amenable number.

521141240 is an abundant number, since it is smaller than the sum of its proper divisors (651426640).

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

521141240 is a wasteful number, since it uses less digits than its factorization.

521141240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13028542 (or 13028538 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 521141240 is about 22828.5181297429. The cubic root of 521141240 is about 804.7330056008.

Adding to 521141240 its reverse (42141125), we get a palindrome (563282365).

The spelling of 521141240 in words is "five hundred twenty-one million, one hundred forty-one thousand, two hundred forty".