845975421 has 20 divisors (see below), whose sum is σ = 1293135712. Its totient is φ = 550865448.

The previous prime is 845975401. The next prime is 845975447. The reversal of 845975421 is 124579548.

845975421 is a `hidden beast` number, since 8 + 4 + 597 + 54 + 2 + 1 = 666.

It is not a de Polignac number, because 845975421 - 2¹⁸ = 845713277 is a prime.

It is a super-2 number, since 2×845975421² = 1431348825872254482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845975401) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 117961 + ... + 124926.

Almost surely, 2^845975421 is an apocalyptic number.

845975421 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

845975421 is a deficient number, since it is larger than the sum of its proper divisors (447160291).

845975421 is a wasteful number, since it uses less digits than its factorization.

845975421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242942 (or 242933 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 845975421 is about 29085.6566197155. The cubic root of 845975421 is about 945.7708298743.

The spelling of 845975421 in words is "eight hundred forty-five million, nine hundred seventy-five thousand, four hundred twenty-one".