420013981 has 8 divisors (see below), whose sum is σ = 452402720. Its totient is φ = 388653552.

The previous prime is 420013969. The next prime is 420013991. The reversal of 420013981 is 189310024.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 420013981 - 2⁹ = 420013469 is a prime.

It is a super-2 number, since 2×420013981² = 352823488470936722, 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 (420013901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256230 + ... + 257863.

It is an arithmetic number, because the mean of its divisors is an integer number (56550340).

Almost surely, 2^420013981 is an apocalyptic number.

It is an amenable number.

420013981 is a deficient number, since it is larger than the sum of its proper divisors (32388739).

420013981 is a wasteful number, since it uses less digits than its factorization.

420013981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514155.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 420013981 is about 20494.2426305536. The cubic root of 420013981 is about 748.8955483062.

It can be divided in two parts, 4200 and 13981, that added together give a palindrome (18181).

The spelling of 420013981 in words is "four hundred twenty million, thirteen thousand, nine hundred eighty-one".