509462138 has 4 divisors (see below), whose sum is σ = 764193210. Its totient is φ = 254731068.

The previous prime is 509462123. The next prime is 509462147. The reversal of 509462138 is 831264905.

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., 486775969 + 22686169 = 22063^2 + 4763^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127365533 + ... + 127365536.

Almost surely, 2^509462138 is an apocalyptic number.

509462138 is a deficient number, since it is larger than the sum of its proper divisors (254731072).

509462138 is a wasteful number, since it uses less digits than its factorization.

509462138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254731071.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 509462138 is about 22571.2679750164. The cubic root of 509462138 is about 798.6760068866.

The spelling of 509462138 in words is "five hundred nine million, four hundred sixty-two thousand, one hundred thirty-eight".