405978875 has 8 divisors (see below), whose sum is σ = 506661792. Its totient is φ = 324783000.

The previous prime is 405978869. The next prime is 405978889. The reversal of 405978875 is 578879504.

It is not a de Polignac number, because 405978875 - 2²² = 401784571 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1623791 + ... + 1624040.

It is an arithmetic number, because the mean of its divisors is an integer number (63332724).

Almost surely, 2^405978875 is an apocalyptic number.

405978875 is a deficient number, since it is larger than the sum of its proper divisors (100682917).

405978875 is an equidigital number, since it uses as much as digits as its factorization.

405978875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247846 (or 3247836 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 53.

The square root of 405978875 is about 20148.9174647176. The cubic root of 405978875 is about 740.4592200771.

The spelling of 405978875 in words is "four hundred five million, nine hundred seventy-eight thousand, eight hundred seventy-five".