405384338 has 18 divisors (see below), whose sum is σ = 636692679. Its totient is φ = 193566252.

The previous prime is 405384337. The next prime is 405384389. The reversal of 405384338 is 833483504.

It can be written as a sum of positive squares in only one way, i.e., 202692169 + 202692169 = 14237^2 + 14237^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=14237.

It is a super-2 number, since 2×405384338² = 328672922991396488, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405384337) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 654593 + ... + 655211.

Almost surely, 2^405384338 is an apocalyptic number.

405384338 is a deficient number, since it is larger than the sum of its proper divisors (231308341).

405384338 is an frugal number, since it uses more digits than its factorization.

405384338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 405384338 is about 20134.1584875058. The cubic root of 405384338 is about 740.0975875683.

The spelling of 405384338 in words is "four hundred five million, three hundred eighty-four thousand, three hundred thirty-eight".