405040623 has 16 divisors (see below), whose sum is σ = 615809376. Its totient is φ = 234593280.

The previous prime is 405040619. The next prime is 405040633. The reversal of 405040623 is 326040504.

It is not a de Polignac number, because 405040623 - 2² = 405040619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 405040593 and 405040602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405040633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304798 + ... + 306123.

It is an arithmetic number, because the mean of its divisors is an integer number (38488086).

Almost surely, 2^405040623 is an apocalyptic number.

405040623 is a deficient number, since it is larger than the sum of its proper divisors (210768753).

405040623 is a wasteful number, since it uses less digits than its factorization.

405040623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610954.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 405040623 is about 20125.6210587400. The cubic root of 405040623 is about 739.8883584926. Note that the first 3 decimals are identical.

The spelling of 405040623 in words is "four hundred five million, forty thousand, six hundred twenty-three".