420069981 has 4 divisors (see below), whose sum is σ = 560093312. Its totient is φ = 280046652.

The previous prime is 420069913. The next prime is 420070003. The reversal of 420069981 is 189960024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 420069981 - 2¹¹ = 420067933 is a prime.

It is a super-2 number, since 2×420069981² = 352917577874680722, 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 (420069581) 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 3 ways as a sum of consecutive naturals, for example, 70011661 + ... + 70011666.

It is an arithmetic number, because the mean of its divisors is an integer number (140023328).

Almost surely, 2^420069981 is an apocalyptic number.

It is an amenable number.

420069981 is a deficient number, since it is larger than the sum of its proper divisors (140023331).

420069981 is a wasteful number, since it uses less digits than its factorization.

420069981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140023330.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 420069981 is about 20495.6088223795. The cubic root of 420069981 is about 748.9288299658.

The spelling of 420069981 in words is "four hundred twenty million, sixty-nine thousand, nine hundred eighty-one".