421291873 has 4 divisors (see below), whose sum is σ = 421461508. Its totient is φ = 421122240.

The previous prime is 421291861. The next prime is 421291877. The reversal of 421291873 is 378192124.

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 42094144 + 379197729 = 6488^2 + 19473^2 .

It is a cyclic number.

It is not a de Polignac number, because 421291873 - 2¹⁷ = 421160801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421291877) 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, 81036 + ... + 86077.

It is an arithmetic number, because the mean of its divisors is an integer number (105365377).

Almost surely, 2^421291873 is an apocalyptic number.

It is an amenable number.

421291873 is a deficient number, since it is larger than the sum of its proper divisors (169635).

421291873 is a wasteful number, since it uses less digits than its factorization.

421291873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169634.

The product of its digits is 24192, while the sum is 37.

The square root of 421291873 is about 20525.3958061714. The cubic root of 421291873 is about 749.6542839243.

The spelling of 421291873 in words is "four hundred twenty-one million, two hundred ninety-one thousand, eight hundred seventy-three".