408506491 has 4 divisors (see below), whose sum is σ = 411211984. Its totient is φ = 405801000.

The previous prime is 408506477. The next prime is 408506503. The reversal of 408506491 is 194605804.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 408506491 - 2²⁵ = 374952059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 408506491.

It is not an unprimeable number, because it can be changed into a prime (408506401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1352520 + ... + 1352821.

It is an arithmetic number, because the mean of its divisors is an integer number (102802996).

Almost surely, 2^408506491 is an apocalyptic number.

408506491 is a deficient number, since it is larger than the sum of its proper divisors (2705493).

408506491 is a wasteful number, since it uses less digits than its factorization.

408506491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705492.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 408506491 is about 20211.5435085992. The cubic root of 408506491 is about 741.9927364682.

The spelling of 408506491 in words is "four hundred eight million, five hundred six thousand, four hundred ninety-one".