408749 has 4 divisors (see below), whose sum is σ = 445920. Its totient is φ = 371580.

The previous prime is 408743. The next prime is 408763. The reversal of 408749 is 947804.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-408749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18569 + ... + 18590.

It is an arithmetic number, because the mean of its divisors is an integer number (111480).

2⁴⁰⁸⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

408749 is a deficient number, since it is larger than the sum of its proper divisors (37171).

408749 is a wasteful number, since it uses less digits than its factorization.

408749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37170.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 408749 is about 639.3348105649. The cubic root of 408749 is about 74.2139534887.

The spelling of 408749 in words is "four hundred eight thousand, seven hundred forty-nine".