8406621 has 6 divisors (see below), whose sum is σ = 12142910. Its totient is φ = 5604408.

The previous prime is 8406583. The next prime is 8406631. The reversal of 8406621 is 1266048.

It can be written as a sum of positive squares in only one way, i.e., 7784100 + 622521 = 2790^2 + 789^2 .

It is not a de Polignac number, because 8406621 - 2¹⁵ = 8373853 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 (8406631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 467026 + ... + 467043.

Almost surely, 2^8406621 is an apocalyptic number.

It is an amenable number.

8406621 is a deficient number, since it is larger than the sum of its proper divisors (3736289).

8406621 is a wasteful number, since it uses less digits than its factorization.

8406621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934075 (or 934072 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 8406621 is about 2899.4173552630. The cubic root of 8406621 is about 203.3326665450.

The spelling of 8406621 in words is "eight million, four hundred six thousand, six hundred twenty-one".