8406989 has 4 divisors (see below), whose sum is σ = 8413056. Its totient is φ = 8400924.

The previous prime is 8406977. The next prime is 8406991. The reversal of 8406989 is 9896048.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8406989 - 2¹⁶ = 8341453 is a prime.

It is a super-2 number, since 2×8406989² = 141354928092242, 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 (8406919) 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, 182 + ... + 4104.

It is an arithmetic number, because the mean of its divisors is an integer number (2103264).

Almost surely, 2^8406989 is an apocalyptic number.

It is an amenable number.

8406989 is a deficient number, since it is larger than the sum of its proper divisors (6067).

8406989 is a wasteful number, since it uses less digits than its factorization.

8406989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6066.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 8406989 is about 2899.4808155944. The cubic root of 8406989 is about 203.3356334656.

The spelling of 8406989 in words is "eight million, four hundred six thousand, nine hundred eighty-nine".