513555440 has 20 divisors (see below), whose sum is σ = 1194016584. Its totient is φ = 205422144.

The previous prime is 513555409. The next prime is 513555451. The reversal of 513555440 is 44555315.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 513555397 and 513555406.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3209642 + ... + 3209801.

Almost surely, 2^513555440 is an apocalyptic number.

It is an amenable number.

513555440 is an abundant number, since it is smaller than the sum of its proper divisors (680461144).

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

513555440 is a wasteful number, since it uses less digits than its factorization.

513555440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6419456 (or 6419450 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 32.

The square root of 513555440 is about 22661.7616261402. The cubic root of 513555440 is about 800.8093060037.

The spelling of 513555440 in words is "five hundred thirteen million, five hundred fifty-five thousand, four hundred forty".