4090781 has 8 divisors (see below), whose sum is σ = 4173624. Its totient is φ = 4008960.

The previous prime is 4090777. The next prime is 4090787. The reversal of 4090781 is 1870904.

It can be written as a sum of positive squares in 4 ways, for example, as 70756 + 4020025 = 266^2 + 2005^2 .

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 4090781 - 2² = 4090777 is a prime.

It is a super-2 number, since 2×4090781² = 33468978379922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4090787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17441 + ... + 17673.

It is an arithmetic number, because the mean of its divisors is an integer number (521703).

Almost surely, 2^4090781 is an apocalyptic number.

It is an amenable number.

4090781 is a deficient number, since it is larger than the sum of its proper divisors (82843).

4090781 is a wasteful number, since it uses less digits than its factorization.

4090781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 4090781 is about 2022.5679222216. The cubic root of 4090781 is about 159.9320153880.

The spelling of 4090781 in words is "four million, ninety thousand, seven hundred eighty-one".