515400420 has 48 divisors (see below), whose sum is σ = 1489678848. Its totient is φ = 133006080.

The previous prime is 515400397. The next prime is 515400443. The reversal of 515400420 is 24004515.

It is an interprime number because it is at equal distance from previous prime (515400397) and next prime (515400443).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136689 + ... + 140408.

It is an arithmetic number, because the mean of its divisors is an integer number (31034976).

Almost surely, 2^515400420 is an apocalyptic number.

It is an amenable number.

515400420 is an abundant number, since it is smaller than the sum of its proper divisors (974278428).

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

515400420 is a wasteful number, since it uses less digits than its factorization.

515400420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277140 (or 277138 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 515400420 is about 22702.4320283092. The cubic root of 515400420 is about 801.7671457042.

Adding to 515400420 its reverse (24004515), we get a palindrome (539404935).

The spelling of 515400420 in words is "five hundred fifteen million, four hundred thousand, four hundred twenty".