408378887 has 20 divisors (see below), whose sum is σ = 482668320. Its totient is φ = 345447648.

The previous prime is 408378881. The next prime is 408378907. The reversal of 408378887 is 788873804.

It is a happy number.

It is not a de Polignac number, because 408378887 - 2⁴ = 408378871 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 (408378881) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 188603 + ... + 190755.

It is an arithmetic number, because the mean of its divisors is an integer number (24133416).

Almost surely, 2^408378887 is an apocalyptic number.

408378887 is a deficient number, since it is larger than the sum of its proper divisors (74289433).

408378887 is an frugal number, since it uses more digits than its factorization.

408378887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260 (or 2239 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 53.

The square root of 408378887 is about 20208.3865511327. The cubic root of 408378887 is about 741.9154703754.

The spelling of 408378887 in words is "four hundred eight million, three hundred seventy-eight thousand, eight hundred eighty-seven".