420989645 has 8 divisors (see below), whose sum is σ = 507285240. Its totient is φ = 335393280.

The previous prime is 420989627. The next prime is 420989659. The reversal of 420989645 is 546989024.

It can be written as a sum of positive squares in 4 ways, for example, as 110208004 + 310781641 = 10498^2 + 17629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 420989645 - 2⁸ = 420989389 is a prime.

It is a super-3 number, since 3×420989645³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 420989645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173480 + ... + 175889.

It is an arithmetic number, because the mean of its divisors is an integer number (63410655).

Almost surely, 2^420989645 is an apocalyptic number.

It is an amenable number.

420989645 is a deficient number, since it is larger than the sum of its proper divisors (86295595).

420989645 is a wasteful number, since it uses less digits than its factorization.

420989645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349615.

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 420989645 is about 20518.0321912215. The cubic root of 420989645 is about 749.4749777398.

The spelling of 420989645 in words is "four hundred twenty million, nine hundred eighty-nine thousand, six hundred forty-five".