406989 has 12 divisors (see below), whose sum is σ = 641472. Its totient is φ = 246600.

The previous prime is 406981. The next prime is 406993. The reversal of 406989 is 989604.

It is not a de Polignac number, because 406989 - 2³ = 406981 is a prime.

It is a super-2 number, since 2×406989² = 331280092242, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 406989.

It is not an unprimeable number, because it can be changed into a prime (406981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1957 + ... + 2154.

It is an arithmetic number, because the mean of its divisors is an integer number (53456).

2⁴⁰⁶⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

406989 is a deficient number, since it is larger than the sum of its proper divisors (234483).

406989 is a wasteful number, since it uses less digits than its factorization.

406989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4128 (or 4125 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 406989 is about 637.9568950956. The cubic root of 406989 is about 74.1072829090.

The spelling of 406989 in words is "four hundred six thousand, nine hundred eighty-nine".