515440420 has 48 divisors (see below), whose sum is σ = 1188427968. Its totient is φ = 186226560.

The previous prime is 515440369. The next prime is 515440421. The reversal of 515440420 is 24044515.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (515440421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27079 + ... + 42001.

It is an arithmetic number, because the mean of its divisors is an integer number (24758916).

Almost surely, 2^515440420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 515440420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (594213984).

515440420 is an abundant number, since it is smaller than the sum of its proper divisors (672987548).

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

515440420 is a wasteful number, since it uses less digits than its factorization.

515440420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15100 (or 15098 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 515440420 is about 22703.3129741014. The cubic root of 515440420 is about 801.7878867662.

Adding to 515440420 its reverse (24044515), we get a palindrome (539484935).

The spelling of 515440420 in words is "five hundred fifteen million, four hundred forty thousand, four hundred twenty".