420989646 has 32 divisors (see below), whose sum is σ = 1049741568. Its totient is φ = 109347840.

The previous prime is 420989627. The next prime is 420989659. The reversal of 420989646 is 646989024.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 420989595 and 420989604.

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, 455155 + ... + 456078.

It is an arithmetic number, because the mean of its divisors is an integer number (32804424).

Almost surely, 2^420989646 is an apocalyptic number.

420989646 is an abundant number, since it is smaller than the sum of its proper divisors (628751922).

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

420989646 is a wasteful number, since it uses less digits than its factorization.

420989646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911256.

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 420989646 is about 20518.0322155903. The cubic root of 420989646 is about 749.4749783332.

The spelling of 420989646 in words is "four hundred twenty million, nine hundred eighty-nine thousand, six hundred forty-six".