490865906 has 4 divisors (see below), whose sum is σ = 736298862. Its totient is φ = 245432952.

The previous prime is 490865897. The next prime is 490865927. The reversal of 490865906 is 609568094.

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., 269124025 + 221741881 = 16405^2 + 14891^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122716475 + ... + 122716478.

Almost surely, 2^490865906 is an apocalyptic number.

490865906 is a deficient number, since it is larger than the sum of its proper divisors (245432956).

490865906 is a wasteful number, since it uses less digits than its factorization.

490865906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245432955.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 490865906 is about 22155.4938107910. The cubic root of 490865906 is about 788.8376357880.

The spelling of 490865906 in words is "four hundred ninety million, eight hundred sixty-five thousand, nine hundred six".