492138509 has 4 divisors (see below), whose sum is σ = 492554304. Its totient is φ = 491722716.

The previous prime is 492138481. The next prime is 492138527. The reversal of 492138509 is 905831294.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 492138509 - 2¹² = 492134413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (492138599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206117 + ... + 208490.

It is an arithmetic number, because the mean of its divisors is an integer number (123138576).

Almost surely, 2^492138509 is an apocalyptic number.

It is an amenable number.

492138509 is a deficient number, since it is larger than the sum of its proper divisors (415795).

492138509 is a wasteful number, since it uses less digits than its factorization.

492138509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415794.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 492138509 is about 22184.1950270908. The cubic root of 492138509 is about 789.5187524549.

The spelling of 492138509 in words is "four hundred ninety-two million, one hundred thirty-eight thousand, five hundred nine".