405885989 has 8 divisors (see below), whose sum is σ = 410302368. Its totient is φ = 401481360.

The previous prime is 405885979. The next prime is 405886043. The reversal of 405885989 is 989588504.

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

It is a cyclic number.

It is not a de Polignac number, because 405885989 - 2¹⁶ = 405820453 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 (405885979) 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 7 ways as a sum of consecutive naturals, for example, 78494 + ... + 83504.

It is an arithmetic number, because the mean of its divisors is an integer number (51287796).

Almost surely, 2^405885989 is an apocalyptic number.

It is an amenable number.

405885989 is a deficient number, since it is larger than the sum of its proper divisors (4416379).

405885989 is a wasteful number, since it uses less digits than its factorization.

405885989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5875.

The product of its (nonzero) digits is 4147200, while the sum is 56.

The square root of 405885989 is about 20146.6123455036. The cubic root of 405885989 is about 740.4027446089.

The spelling of 405885989 in words is "four hundred five million, eight hundred eighty-five thousand, nine hundred eighty-nine".