4090421 has 8 divisors (see below), whose sum is σ = 4480920. Its totient is φ = 3716608.

The previous prime is 4090403. The next prime is 4090423. The reversal of 4090421 is 1240904.

It can be written as a sum of positive squares in 4 ways, for example, as 2515396 + 1575025 = 1586^2 + 1255^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-4090421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4090393 and 4090402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4090423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3656 + ... + 4641.

It is an arithmetic number, because the mean of its divisors is an integer number (560115).

Almost surely, 2^4090421 is an apocalyptic number.

It is an amenable number.

4090421 is a deficient number, since it is larger than the sum of its proper divisors (390499).

4090421 is a wasteful number, since it uses less digits than its factorization.

4090421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8343.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 4090421 is about 2022.4789244885. The cubic root of 4090421 is about 159.9273237644.

The spelling of 4090421 in words is "four million, ninety thousand, four hundred twenty-one".