405386890 has 12 divisors (see below), whose sum is σ = 729811026. Its totient is φ = 162129288.

The previous prime is 405386887. The next prime is 405386899. The reversal of 405386890 is 98683504.

It can be written as a sum of positive squares in only one way, i.e., 364848201 + 40538689 = 19101^2 + 6367^2 .

It is not an unprimeable number, because it can be changed into a prime (405386899) 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 5 ways as a sum of consecutive naturals, for example, 60487 + ... + 66853.

Almost surely, 2^405386890 is an apocalyptic number.

405386890 is a deficient number, since it is larger than the sum of its proper divisors (324424136).

405386890 is an frugal number, since it uses more digits than its factorization.

405386890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12741 (or 6374 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 405386890 is about 20134.2218622921. The cubic root of 405386890 is about 740.0991406008.

Multiplying 405386890 by its product of nonzero digits (207360), we get a square (84061025510400 = 9168480²).

The spelling of 405386890 in words is "four hundred five million, three hundred eighty-six thousand, eight hundred ninety".