490861 has 4 divisors (see below), whose sum is σ = 560992. Its totient is φ = 420732.

The previous prime is 490859. The next prime is 490877. The reversal of 490861 is 168094.

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, and also an emirpimes, since its reverse is a distinct semiprime: 168094 = 2 ⋅84047.

It is a cyclic number.

It is not a de Polignac number, because 490861 - 2¹ = 490859 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 (490891) 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, 35055 + ... + 35068.

It is an arithmetic number, because the mean of its divisors is an integer number (140248).

2⁴⁹⁰⁸⁶¹ is an apocalyptic number.

490861 is the 405-th hex number.

It is an amenable number.

490861 is a deficient number, since it is larger than the sum of its proper divisors (70131).

490861 is an equidigital number, since it uses as much as digits as its factorization.

490861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70130.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 490861 is about 700.6147300764. The cubic root of 490861 is about 78.8835007745.

The spelling of 490861 in words is "four hundred ninety thousand, eight hundred sixty-one".