420855981 has 16 divisors (see below), whose sum is σ = 690635904. Its totient is φ = 221989824.

The previous prime is 420855949. The next prime is 420855997. The reversal of 420855981 is 189558024.

It is a happy number.

It is not a de Polignac number, because 420855981 - 2⁵ = 420855949 is a prime.

It is a super-2 number, since 2×420855981² = 354239513486944722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420855901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 770526 + ... + 771071.

It is an arithmetic number, because the mean of its divisors is an integer number (43164744).

Almost surely, 2^420855981 is an apocalyptic number.

It is an amenable number.

420855981 is a deficient number, since it is larger than the sum of its proper divisors (269779923).

420855981 is a wasteful number, since it uses less digits than its factorization.

420855981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541620.

The product of its (nonzero) digits is 115200, while the sum is 42.

The square root of 420855981 is about 20514.7747002008. The cubic root of 420855981 is about 749.3956500345.

The spelling of 420855981 in words is "four hundred twenty million, eight hundred fifty-five thousand, nine hundred eighty-one".