405251440878 has 8 divisors (see below), whose sum is σ = 810502881768. Its totient is φ = 135083813624.

The previous prime is 405251440871. The next prime is 405251440879. The reversal of 405251440878 is 878044152504.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

405251440878 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405251440871) 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, 33770953401 + ... + 33770953412.

It is an arithmetic number, because the mean of its divisors is an integer number (101312860221).

Almost surely, 2^405251440878 is an apocalyptic number.

405251440878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405251440878 is a wasteful number, since it uses less digits than its factorization.

405251440878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67541906818.

The product of its (nonzero) digits is 1433600, while the sum is 48.

The spelling of 405251440878 in words is "four hundred five billion, two hundred fifty-one million, four hundred forty thousand, eight hundred seventy-eight".