421261878 has 16 divisors (see below), whose sum is σ = 846051840. Its totient is φ = 139832616.

The previous prime is 421261873. The next prime is 421261933. The reversal of 421261878 is 878162124.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421261873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145450 + ... + 148317.

It is an arithmetic number, because the mean of its divisors is an integer number (52878240).

Almost surely, 2^421261878 is an apocalyptic number.

421261878 is an abundant number, since it is smaller than the sum of its proper divisors (424789962).

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

421261878 is a wasteful number, since it uses less digits than its factorization.

421261878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294011.

The product of its digits is 43008, while the sum is 39.

The square root of 421261878 is about 20524.6651129805. The cubic root of 421261878 is about 749.6364922891.

The spelling of 421261878 in words is "four hundred twenty-one million, two hundred sixty-one thousand, eight hundred seventy-eight".