420695781 has 8 divisors (see below), whose sum is σ = 611921184. Its totient is φ = 254967120.

The previous prime is 420695773. The next prime is 420695797. The reversal of 420695781 is 187596024.

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

It is not a de Polignac number, because 420695781 - 2³ = 420695773 is a prime.

It is a super-2 number, since 2×420695781² = 353969880302399922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420695741) 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, 6374146 + ... + 6374211.

It is an arithmetic number, because the mean of its divisors is an integer number (76490148).

Almost surely, 2^420695781 is an apocalyptic number.

It is an amenable number.

420695781 is a deficient number, since it is larger than the sum of its proper divisors (191225403).

420695781 is a wasteful number, since it uses less digits than its factorization.

420695781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12748371.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 420695781 is about 20510.8698255340. The cubic root of 420695781 is about 749.3005514540.

The spelling of 420695781 in words is "four hundred twenty million, six hundred ninety-five thousand, seven hundred eighty-one".