421386929 has 4 divisors (see below), whose sum is σ = 424462884. Its totient is φ = 418310976.

The previous prime is 421386923. The next prime is 421386961. The reversal of 421386929 is 929683124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 126337600 + 295049329 = 11240^2 + 17177^2 .

It is a cyclic number.

It is not a de Polignac number, because 421386929 - 2²⁴ = 404609713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421386929.

It is not an unprimeable number, because it can be changed into a prime (421386923) 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, 1537772 + ... + 1538045.

It is an arithmetic number, because the mean of its divisors is an integer number (106115721).

Almost surely, 2^421386929 is an apocalyptic number.

It is an amenable number.

421386929 is a deficient number, since it is larger than the sum of its proper divisors (3075955).

421386929 is a wasteful number, since it uses less digits than its factorization.

421386929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075954.

The product of its digits is 186624, while the sum is 44.

The square root of 421386929 is about 20527.7112460206. The cubic root of 421386929 is about 749.7106611325.

The spelling of 421386929 in words is "four hundred twenty-one million, three hundred eighty-six thousand, nine hundred twenty-nine".