513842138 has 4 divisors (see below), whose sum is σ = 770763210. Its totient is φ = 256921068.

The previous prime is 513842107. The next prime is 513842179. The reversal of 513842138 is 831248315.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 307546369 + 206295769 = 17537^2 + 14363^2 .

It is a super-2 number, since 2×513842138² = 528067485568822088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 513842098 and 513842107.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128460533 + ... + 128460536.

Almost surely, 2^513842138 is an apocalyptic number.

513842138 is a deficient number, since it is larger than the sum of its proper divisors (256921072).

513842138 is a wasteful number, since it uses less digits than its factorization.

513842138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256921071.

The product of its digits is 23040, while the sum is 35.

The square root of 513842138 is about 22668.0863329925. The cubic root of 513842138 is about 800.9582984966.

The spelling of 513842138 in words is "five hundred thirteen million, eight hundred forty-two thousand, one hundred thirty-eight".