405345623 has 4 divisors (see below), whose sum is σ = 409359048. Its totient is φ = 401332200.

The previous prime is 405345617. The next prime is 405345631. The reversal of 405345623 is 326543504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405345623 - 2¹² = 405341527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 405345623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405345223) 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 3 ways as a sum of consecutive naturals, for example, 2006561 + ... + 2006762.

It is an arithmetic number, because the mean of its divisors is an integer number (102339762).

Almost surely, 2^405345623 is an apocalyptic number.

405345623 is a deficient number, since it is larger than the sum of its proper divisors (4013425).

405345623 is a wasteful number, since it uses less digits than its factorization.

405345623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4013424.

The product of its (nonzero) digits is 43200, while the sum is 32.

The square root of 405345623 is about 20133.1970387219. The cubic root of 405345623 is about 740.0740265608.

The spelling of 405345623 in words is "four hundred five million, three hundred forty-five thousand, six hundred twenty-three".