405998494 has 8 divisors (see below), whose sum is σ = 664361208. Its totient is φ = 184544760.

The previous prime is 405998477. The next prime is 405998501. The reversal of 405998494 is 494899504.

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

It is a congruent number.

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, 9227217 + ... + 9227260.

It is an arithmetic number, because the mean of its divisors is an integer number (83045151).

Almost surely, 2^405998494 is an apocalyptic number.

405998494 is a deficient number, since it is larger than the sum of its proper divisors (258362714).

405998494 is a wasteful number, since it uses less digits than its factorization.

405998494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18454490.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 405998494 is about 20149.4043088127. The cubic root of 405998494 is about 740.4711474920.

It can be divided in two parts, 405 and 998494, that added together give a palindrome (998899).

The spelling of 405998494 in words is "four hundred five million, nine hundred ninety-eight thousand, four hundred ninety-four".