420389778 has 8 divisors (see below), whose sum is σ = 840779568. Its totient is φ = 140129924.

The previous prime is 420389777. The next prime is 420389831. The reversal of 420389778 is 877983024.

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

420389778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (420389773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35032476 + ... + 35032487.

It is an arithmetic number, because the mean of its divisors is an integer number (105097446).

Almost surely, 2^420389778 is an apocalyptic number.

420389778 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.

420389778 is a wasteful number, since it uses less digits than its factorization.

420389778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70064968.

The product of its (nonzero) digits is 677376, while the sum is 48.

The square root of 420389778 is about 20503.4089360769. The cubic root of 420389778 is about 749.1188335775.

The spelling of 420389778 in words is "four hundred twenty million, three hundred eighty-nine thousand, seven hundred seventy-eight".