423942929881 has 3 divisors (see below), whose sum is σ = 423943580991. Its totient is φ = 423942278772.

The previous prime is 423942929867. The next prime is 423942929897. The reversal of 423942929881 is 188929249324.

The square root of 423942929881 is 651109.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 233201102281 + 190741827600 = 482909^2 + 436740^2 .

It is not a de Polignac number, because 423942929881 - 2¹⁵ = 423942897113 is a prime.

It is a super-2 number, since 2×423942929881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423942929821) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 325555 + ... + 976663.

It is an arithmetic number, because the mean of its divisors is an integer number (141314526997).

Almost surely, 2^423942929881 is an apocalyptic number.

423942929881 is the 651109-th square number.

423942929881 is the 325555-th centered octagonal number.

It is an amenable number.

423942929881 is a deficient number, since it is larger than the sum of its proper divisors (651110).

423942929881 is an frugal number, since it uses more digits than its factorization.

423942929881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302218 (or 651109 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 61.

The spelling of 423942929881 in words is "four hundred twenty-three billion, nine hundred forty-two million, nine hundred twenty-nine thousand, eight hundred eighty-one".