420837823781 has 8 divisors (see below), whose sum is σ = 422893587864. Its totient is φ = 418786018560.

The previous prime is 420837823759. The next prime is 420837823799. The reversal of 420837823781 is 187328738024.

It can be written as a sum of positive squares in 4 ways, for example, as 120988491556 + 299849332225 = 347834^2 + 547585^2 .

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 420837823781 - 2¹⁸ = 420837561637 is a prime.

It is a super-2 number, since 2×420837823781² (a number of 24 digits) 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 (420837823481) 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, 776480 + ... + 1201913.

It is an arithmetic number, because the mean of its divisors is an integer number (52861698483).

Almost surely, 2^420837823781 is an apocalyptic number.

It is an amenable number.

420837823781 is a deficient number, since it is larger than the sum of its proper divisors (2055764083).

420837823781 is a wasteful number, since it uses less digits than its factorization.

420837823781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979431.

The product of its (nonzero) digits is 3612672, while the sum is 53.

The spelling of 420837823781 in words is "four hundred twenty billion, eight hundred thirty-seven million, eight hundred twenty-three thousand, seven hundred eighty-one".