408790387 has 4 divisors (see below), whose sum is σ = 410235160. Its totient is φ = 407345616.

The previous prime is 408790357. The next prime is 408790391. The reversal of 408790387 is 783097804.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408790387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (408790307) 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, 721962 + ... + 722527.

It is an arithmetic number, because the mean of its divisors is an integer number (102558790).

Almost surely, 2^408790387 is an apocalyptic number.

408790387 is a deficient number, since it is larger than the sum of its proper divisors (1444773).

408790387 is a wasteful number, since it uses less digits than its factorization.

408790387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444772.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 408790387 is about 20218.5654041032. The cubic root of 408790387 is about 742.1645819556.

The spelling of 408790387 in words is "four hundred eight million, seven hundred ninety thousand, three hundred eighty-seven".