405390340 has 12 divisors (see below), whose sum is σ = 851319756. Its totient is φ = 162156128.

The previous prime is 405390311. The next prime is 405390353. The reversal of 405390340 is 43093504.

It can be written as a sum of positive squares in 2 ways, for example, as 221950404 + 183439936 = 14898^2 + 13544^2 .

It is a junction number, because it is equal to n+sod(n) for n = 405390299 and 405390308.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10134739 + ... + 10134778.

It is an arithmetic number, because the mean of its divisors is an integer number (70943313).

Almost surely, 2^405390340 is an apocalyptic number.

It is an amenable number.

405390340 is an abundant number, since it is smaller than the sum of its proper divisors (445929416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405390340 is a wasteful number, since it uses less digits than its factorization.

405390340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20269526 (or 20269524 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 405390340 is about 20134.3075371367. The cubic root of 405390340 is about 740.1012401053.

The spelling of 405390340 in words is "four hundred five million, three hundred ninety thousand, three hundred forty".