421573685 has 16 divisors (see below), whose sum is σ = 558094320. Its totient is φ = 303720960.

The previous prime is 421573661. The next prime is 421573699. The reversal of 421573685 is 586375124.

421573685 = 14518² + 14519².

It can be written as a sum of positive squares in 8 ways, for example, as 120516484 + 301057201 = 10978^2 + 17351^2 .

It is not a de Polignac number, because 421573685 - 2¹⁰ = 421572661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76430 + ... + 81759.

It is an arithmetic number, because the mean of its divisors is an integer number (34880895).

Almost surely, 2^421573685 is an apocalyptic number.

421573685 is the 14519-th centered square number.

It is an amenable number.

421573685 is a deficient number, since it is larger than the sum of its proper divisors (136520635).

421573685 is a wasteful number, since it uses less digits than its factorization.

421573685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158248.

The product of its digits is 201600, while the sum is 41.

The square root of 421573685 is about 20532.2596174897. The cubic root of 421573685 is about 749.8214004359.

The spelling of 421573685 in words is "four hundred twenty-one million, five hundred seventy-three thousand, six hundred eighty-five".