405998546 has 8 divisors (see below), whose sum is σ = 612877260. Its totient is φ = 201706128.

The previous prime is 405998533. The next prime is 405998563. The reversal of 405998546 is 645899504.

It can be written as a sum of positive squares in 2 ways, for example, as 365230321 + 40768225 = 19111^2 + 6385^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×405998546² = 329669638708228232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 405998494 and 405998503.

It is an unprimeable number.

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, 646181 + ... + 646808.

Almost surely, 2^405998546 is an apocalyptic number.

405998546 is a deficient number, since it is larger than the sum of its proper divisors (206878714).

405998546 is a wasteful number, since it uses less digits than its factorization.

405998546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293148.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The square root of 405998546 is about 20149.4055991734. The cubic root of 405998546 is about 740.4711791050.

The spelling of 405998546 in words is "four hundred five million, nine hundred ninety-eight thousand, five hundred forty-six".