8420641 has 4 divisors (see below), whose sum is σ = 8471232. Its totient is φ = 8370052.

The previous prime is 8420603. The next prime is 8420651. The reversal of 8420641 is 1460248.

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.

It is a cyclic number.

It is not a de Polignac number, because 8420641 - 2¹⁹ = 7896353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8420651) 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, 25045 + ... + 25378.

It is an arithmetic number, because the mean of its divisors is an integer number (2117808).

Almost surely, 2^8420641 is an apocalyptic number.

It is an amenable number.

8420641 is a deficient number, since it is larger than the sum of its proper divisors (50591).

8420641 is a wasteful number, since it uses less digits than its factorization.

8420641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50590.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 8420641 is about 2901.8340752014. The cubic root of 8420641 is about 203.4456386378.

Adding to 8420641 its reverse (1460248), we get a palindrome (9880889).

The spelling of 8420641 in words is "eight million, four hundred twenty thousand, six hundred forty-one".