420409878 has 64 divisors (see below), whose sum is σ = 975421440. Its totient is φ = 118323072.

The previous prime is 420409867. The next prime is 420409901. The reversal of 420409878 is 878904024.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1434700 + ... + 1434992.

It is an arithmetic number, because the mean of its divisors is an integer number (15240960).

Almost surely, 2^420409878 is an apocalyptic number.

420409878 is an abundant number, since it is smaller than the sum of its proper divisors (555011562).

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

420409878 is a wasteful number, since it uses less digits than its factorization.

420409878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 420409878 is about 20503.8990926116. The cubic root of 420409878 is about 749.1307725362.

The spelling of 420409878 in words is "four hundred twenty million, four hundred nine thousand, eight hundred seventy-eight".