405978878 has 8 divisors (see below), whose sum is σ = 609054768. Its totient is φ = 202960624.

The previous prime is 405978869. The next prime is 405978889. The reversal of 405978878 is 878879504.

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, 16250 + ... + 32802.

It is an arithmetic number, because the mean of its divisors is an integer number (76131846).

Almost surely, 2^405978878 is an apocalyptic number.

405978878 is a deficient number, since it is larger than the sum of its proper divisors (203075890).

405978878 is a wasteful number, since it uses less digits than its factorization.

405978878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28818.

The product of its (nonzero) digits is 4515840, while the sum is 56.

The square root of 405978878 is about 20148.9175391632. The cubic root of 405978878 is about 740.4592219010.

The spelling of 405978878 in words is "four hundred five million, nine hundred seventy-eight thousand, eight hundred seventy-eight".