515406421 has 8 divisors (see below), whose sum is σ = 519265080. Its totient is φ = 511562688.

The previous prime is 515406383. The next prime is 515406427. The reversal of 515406421 is 124604515.

It can be written as a sum of positive squares in 4 ways, for example, as 343396 + 515063025 = 586^2 + 22695^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 515406421 - 2¹³ = 515398229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 515406421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515406427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71055 + ... + 77971.

It is an arithmetic number, because the mean of its divisors is an integer number (64908135).

Almost surely, 2^515406421 is an apocalyptic number.

It is an amenable number.

515406421 is a deficient number, since it is larger than the sum of its proper divisors (3858659).

515406421 is a wasteful number, since it uses less digits than its factorization.

515406421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7463.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 515406421 is about 22702.5641943812. The cubic root of 515406421 is about 801.7702574505.

The spelling of 515406421 in words is "five hundred fifteen million, four hundred six thousand, four hundred twenty-one".