8490781 has 8 divisors (see below), whose sum is σ = 9201024. Its totient is φ = 7788720.

The previous prime is 8490763. The next prime is 8490787. The reversal of 8490781 is 1870948.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8490781 - 2¹³ = 8482589 is a prime.

It is a super-2 number, since 2×8490781² = 144186723979922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8490781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8490787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216 + ... + 4126.

It is an arithmetic number, because the mean of its divisors is an integer number (1150128).

Almost surely, 2^8490781 is an apocalyptic number.

It is an amenable number.

8490781 is a deficient number, since it is larger than the sum of its proper divisors (710243).

8490781 is a wasteful number, since it uses less digits than its factorization.

8490781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 8490781 is about 2913.8944730378. The cubic root of 8490781 is about 204.0089464870.

The spelling of 8490781 in words is "eight million, four hundred ninety thousand, seven hundred eighty-one".