405665051 has 8 divisors (see below), whose sum is σ = 446029824. Its totient is φ = 365881320.

The previous prime is 405665047. The next prime is 405665087. The reversal of 405665051 is 150566504.

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 405665051 - 2² = 405665047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405664999 and 405665017.

It is not an unprimeable number, because it can be changed into a prime (405665251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143795 + ... + 146588.

It is an arithmetic number, because the mean of its divisors is an integer number (55753728).

Almost surely, 2^405665051 is an apocalyptic number.

405665051 is a deficient number, since it is larger than the sum of its proper divisors (40364773).

405665051 is a wasteful number, since it uses less digits than its factorization.

405665051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290521.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 405665051 is about 20141.1283447576. The cubic root of 405665051 is about 740.2683778193.

The spelling of 405665051 in words is "four hundred five million, six hundred sixty-five thousand, fifty-one".