405043861 has 8 divisors (see below), whose sum is σ = 426000384. Its totient is φ = 384580560.

The previous prime is 405043831. The next prime is 405043871. The reversal of 405043861 is 168340504.

It is a happy number.

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 405043861 - 2¹⁵ = 405011093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405043801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121621 + ... + 124906.

It is an arithmetic number, because the mean of its divisors is an integer number (53250048).

Almost surely, 2^405043861 is an apocalyptic number.

It is an amenable number.

405043861 is a deficient number, since it is larger than the sum of its proper divisors (20956523).

405043861 is a wasteful number, since it uses less digits than its factorization.

405043861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246611.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 405043861 is about 20125.7015033017. The cubic root of 405043861 is about 739.8903301073.

The spelling of 405043861 in words is "four hundred five million, forty-three thousand, eight hundred sixty-one".