490398787 has 4 divisors (see below), whose sum is σ = 507309120. Its totient is φ = 473488456.

The previous prime is 490398767. The next prime is 490398809. The reversal of 490398787 is 787893094.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 787893094 = 2 ⋅393946547.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-490398787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (490398707) 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, 8455123 + ... + 8455180.

It is an arithmetic number, because the mean of its divisors is an integer number (126827280).

Almost surely, 2^490398787 is an apocalyptic number.

490398787 is a deficient number, since it is larger than the sum of its proper divisors (16910333).

490398787 is a wasteful number, since it uses less digits than its factorization.

490398787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16910332.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The square root of 490398787 is about 22144.9494693485. The cubic root of 490398787 is about 788.5873311801.

The spelling of 490398787 in words is "four hundred ninety million, three hundred ninety-eight thousand, seven hundred eighty-seven".